Annual report pursuant to Section 13 and 15(d)

Fresh Start Accounting - Footnotes (Details)

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Fresh Start Accounting - Footnotes (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Sep. 30, 2019
Mar. 30, 2019
Mar. 26, 2019
Jan. 22, 2014
Jul. 30, 2013
Fresh-Start Adjustment [Line Items]                
Net change in cash and cash equivalents $ 127,849,000       $ 51,777,000      
Net change in other current assets 16,737,000       25,501,000      
Net change in other non-current assets 29,139,000       27,342,000      
Liabilities subject to compromise 0       600,996,000      
Gain on settlement of liabilities subject to compromise 191,129,000 $ 0 $ 0          
Net change in predecessor capital in excess of par value 342,650,000       767,793,000      
Net change in successor common stock 150,000       1,398,000      
Net change in accumulated deficit         (681,246,000)      
Intangible assets, net 18,000,000       4,245,000      
Customer relationships                
Fresh-Start Adjustment [Line Items]                
Intangible assets, net 16,300,000       0      
Trade names                
Fresh-Start Adjustment [Line Items]                
Intangible assets, net 1,500,000       368,000      
Developed technology                
Fresh-Start Adjustment [Line Items]                
Intangible assets, net 200,000       3,877,000      
Successor term loan, due March 2024                
Fresh-Start Adjustment [Line Items]                
Aggregate principal amount 210,000,000.0              
Fixed interest rate           13.00%    
Predecessor 7.50% senior notes, due August 2020                
Fresh-Start Adjustment [Line Items]                
Aggregate principal amount               $ 225,000,000.0
Fixed interest rate   7.50%   7.50%       7.50%
Predecessor 6.75% senior notes, due July 2022                
Fresh-Start Adjustment [Line Items]                
Aggregate principal amount             $ 360,000,000.0  
Fixed interest rate   6.75%   6.75%     6.75%  
Reorganization Adjustments                
Fresh-Start Adjustment [Line Items]                
Proceeds from the rights offering 95,000,000              
Transfers from restricted cash for the return of cash collateral (for letters of credit) 10,433,000              
Proceeds from refund of backstop commitment fee 7,600,000              
Transfers from restricted cash for deposit releases 250,000              
Transfers to restricted cash for funding of professional fees (21,049,000)              
Payment of debtor in possession financing principal and interest (10,035,000)              
Payment of professional fees (5,154,000)              
Payment of debt issuance costs for the successor credit facility (490,000)              
Payment of fees on letters of credit (58,000)              
Payment of term loan agent fees (50,000)              
Payment of other reorganization expenses (375,000)              
Net change in cash and cash equivalents 76,072,000              
Refund of backstop commitment fee (7,600,000)              
Elimination of predecessor directors and officers insurance policies (702,000)              
Reclass of prepaid costs related to the successor credit facility (488,000)              
Payment of other costs related to the successor credit facility 26,000              
Net change in other current assets (8,764,000)              
Capitalization of debt issuance costs on the successor credit facility 765,000              
Reclass of prepaid costs related to the successor credit facility 488,000              
Net change in other non-current assets 1,253,000              
Accrual of professional fees 7,100,000              
Payment of professional fees (2,017,000)              
Payment of debtor in possession financing interest (35,000)              
Payment of letters of credit fees (58,000)              
Net change in accrued liabilities 4,990,000              
Liabilities subject to compromise (600,996,000)              
Issuance of successor common stock to the 7.50% note holders and 6.75% note holders 175,058,000              
Excess fair value ascribed to lenders participating in equity rights offering 24,809,000              
Gain on settlement of liabilities subject to compromise (191,129,000)              
Cancellation of predecessor preferred stock         500,000      
Cancellation of predecessor common stock         1,398,000      
Issuance of successor warrants to predecessor common stock and predecessor preferred stock holders         (14,687,000)      
Issuance of successor common stock to predecessor common stock and predecessor preferred stock holders         (4,950,000)      
Excess fair value ascribed to parties participating in rights offering, excluding lenders         (18,100,000)      
Net change in predecessor capital in excess of par value 342,650,000       (35,839,000)      
Issuance of successor common stock to the 7.50% note holders and 6.75% note holders 80,000              
Issuance of successor common stock pursuant to rights offering 68,000              
Issuance of successor common stock to predecessor common stock and predecessor preferred stock holders 2,000              
Net change in successor common stock 150,000       $ (1,398,000)      
Issuance of successor common stock to the 7.50% note holders and 6.75% note holders 174,978,000              
Issuance of successor common stock pursuant to rights offering 148,874,000              
Issuance of successor warrants to predecessor common stock and predecessor preferred stock holders 14,687,000              
Issuance of successor common stock to predecessor common stock and predecessor preferred stock holders 4,948,000              
Equity issuance costs (837,000)              
Gain on settlement of liabilities subject to compromise 191,129,000              
Backstop premium on rights offering (11,032,000)              
Accrual of professional fees (5,988,000)              
Payment of professional fees (3,137,000)              
Elimination of predecessor directors and officers insurance policies (702,000)              
Payment of other reorganization items (400,000)              
Net change in accumulated deficit 169,870,000              
Intangible assets, net 0              
Fresh Start Adjustments                
Fresh-Start Adjustment [Line Items]                
Net change in cash and cash equivalents 0              
Net change in other current assets 0              
Net change in other non-current assets 544,000              
Liabilities subject to compromise 0              
Net change in predecessor capital in excess of par value (731,954,000)              
Net change in accumulated deficit 511,376,000              
Intangible assets, net 13,755,000              
Fair value adjustment to rig material and supplies (6,845,000)              
Net change in rig materials and supplies (6,845,000)              
Fair value adjustment to investment in non-consolidated subsidiaries 2,290,000              
Fair value adjustment to long-term notes receivable (272,000)              
Elimination of capitalized mobilization costs (857,000)              
Elimination of long-term other deferred charges (617,000)              
Elimination of deferred rent (1,100,000)              
Elimination of deferred revenue (2,768,000)              
Net change in accrued liabilities $ (3,868,000)