Annual report pursuant to Section 13 and 15(d)

Acquisitions of ITS - Preliminary Allocation of Consideration Transferred (Details)

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Acquisitions of ITS - Preliminary Allocation of Consideration Transferred (Details) (USD $)
 3 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended
Dec. 31, 2011
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Apr. 22, 2013
ITS [Member]
Dec. 31, 2013
ITS [Member]
Business Acquisition [Line Items]            
Cash and cash equivalents         $ 7,009,000  
Accounts and notes receivable, net         50,043,000  
Other current assets         1,803,000  
Accounts payable and accrued liabilities         (39,156,000)  
Accrued income taxes         (1,251,000)  
Working capital excluding rig materials and supplies         18,448,000  
Rig materials and supplies         11,514,000  
Property, plant and equipment, net         73,863,000  
Investment in joint venture         4,134,000  
Other noncurrent assets         2,818,000  
Total tangible assets         110,777,000  
Deferred income tax assets - current         222,000  
Deferred income tax assets - noncurrent         11,249,000  
Intangible Assets            
Trade name, developed technology, and customer relationship         8,500,000  
Total assets acquired         130,748,000  
Other long-term liabilities         (211,000)  
Long-term deferred tax liability         (2,856,000)  
Net assets acquired         127,681,000  
Less: Noncontrolling interest         (2,681,000)  
Total consideration transferred         125,000,000  
Accounts and notes receivable, gross         55,900,000  
Adjustment to record property, plant and equipment to fair value 170,000,000 0 0 170,000,000 40,200,000  
Increase in deferred income tax asset   12,699,000 15,837,000 (48,375,000) 5,000,000  
Intangible assets acquired         8,500,000  
Weighted average useful life         3 years 4 months 24 days 3 years
Impairment of non-controlling interest         $ 1,000,000