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Business segments (Income Statement by Segment) (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2015
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Segment Reporting Information [Line Items]                      
Net sales $ 147,203,000 $ 138,268,000 $ 142,723,000 $ 159,441,000 $ 196,148,000 $ 244,993,000 $ 284,415,000 $ 348,096,000 $ 587,635,000 $ 1,073,652,000 $ 1,739,717,000
Operating income (loss) $ (24,839,000) $ (26,222,000) $ (52,878,000) $ (25,013,000) (188,586,000) $ 12,193,000 $ 22,438,000 $ 40,232,000 (128,952,000) (113,723,000) 268,038,000
Goodwill and Intangible asset impairment         $ 125,092       0 125,092,000 0
Transaction expenses                 865,000 480,000 2,326,000
(Gain)/loss on sale of assets                 2,638,000 746,000 1,431,000
Operating Segments                      
Segment Reporting Information [Line Items]                      
Operating income (loss)                 (125,449,000) 12,595,000 271,795,000
Depreciation and amortization                 61,760,000 65,683,000 65,072,000
Capital expenditures                 16,828,000 32,291,000 53,792,000
Operating Segments | Drilling & Subsea                      
Segment Reporting Information [Line Items]                      
Net sales                 227,872,000 487,299,000 864,320,000
Operating income (loss)                 (53,589,000) 6,890,000 131,072,000
Depreciation and amortization                 27,765,000 33,348,000 36,148,000
Capital expenditures                 7,822,000 13,803,000 22,891,000
Operating Segments | Completions                      
Segment Reporting Information [Line Items]                      
Net sales                 127,432,000 267,236,000 441,345,000
Operating income (loss)                 (45,075,000) 11,124,000 126,590,000
Depreciation and amortization                 23,405,000 24,317,000 20,135,000
Capital expenditures                 2,509,000 8,401,000 19,942,000
Operating Segments | Production & Infrastructure                      
Segment Reporting Information [Line Items]                      
Net sales                 233,754,000 320,442,000 436,271,000
Operating income (loss)                 655,000 22,658,000 56,148,000
Depreciation and amortization                 4,935,000 7,377,000 7,856,000
Capital expenditures                 1,953,000 3,102,000 4,569,000
Operating Segments | Corporate, Non-segment                      
Segment Reporting Information [Line Items]                      
Operating income (loss)                 (27,440,000) (28,077,000) (42,015,000)
Depreciation and amortization                 5,655,000 641,000 933,000
Capital expenditures                 4,544,000 6,985,000 6,390,000
Intersegment Eliminations                      
Segment Reporting Information [Line Items]                      
Net sales                 $ (1,423,000) $ (1,325,000) $ (2,219,000)