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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

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- Definition

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 28
-Subparagraph (b)
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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

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-Name Accounting Standards Codification
-Topic 230
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-Paragraph 13
-Subparagraph (c)
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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
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