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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)

X
- Definition This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 25 -Paragraph 23 -URI http://asc.fasb.org/extlink&oid=73531572&loc=d3e1043-128460 + Details
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