Annual report pursuant to Section 13 and 15(d)

Schedule II - Valuation and Qualifying Accounts (Details)

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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2019
Dec. 31, 2019
Dec. 31, 2018
Allowance for bad debt      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year $ 7,767 $ 0 $ 7,564
Charged to cost and expenses 90 336 309
Charged to other accounts 11 428 (47)
Deductions (7,868) (421) (59)
Balance at end of year 0 343 7,767
Allowance for obsolete rig materials and supplies      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year 1,547 1 809
Charged to cost and expenses 0 0 1,041
Charged to other accounts 0 0 0
Deductions (1,546) 0 (303)
Balance at end of year 1 1 1,547
Deferred tax valuation allowance      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of year 186,267 87,411 157,914
Charged to cost and expenses (98,856) 3,706 28,353
Charged to other accounts 0 0
Deductions 0 0 0
Balance at end of year $ 87,411 $ 91,117 $ 186,267