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Business segments (Revenue by Product Lines) (Details) - USD ($) $ in Thousands	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
Revenue from External Customer [Line Items]
Net sales	$ 147,203	$ 138,268	$ 142,723	$ 159,441	$ 196,148	$ 244,993	$ 284,415	$ 348,096	$ 587,635	$ 1,073,652	$ 1,739,717
Sales
Revenue from External Customer [Line Items]
Net sales									$ 587,635	$ 1,073,652	$ 1,739,717
Percentage of net sales									100.00%	100.00%	100.00%
Operating Segments | Sales | Drilling Technologies
Revenue from External Customer [Line Items]
Net sales									$ 139,458	$ 298,209	$ 543,281
Percentage of net sales									23.70%	27.70%	31.10%
Operating Segments | Sales | Subsea Technologies
Revenue from External Customer [Line Items]
Net sales									$ 88,414	$ 189,090	$ 321,039
Percentage of net sales									15.00%	17.60%	18.50%
Operating Segments | Sales | Downhole Technologies
Revenue from External Customer [Line Items]
Net sales									$ 55,191	$ 106,532	$ 190,771
Percentage of net sales									9.40%	9.90%	11.00%
Operating Segments | Sales | Stimulation and Intervention
Revenue from External Customer [Line Items]
Net sales									$ 72,241	$ 160,704	$ 250,574
Percentage of net sales									12.30%	15.00%	14.40%
Operating Segments | Sales | Production Equipment
Revenue from External Customer [Line Items]
Net sales									$ 77,166	$ 145,927	$ 228,815
Percentage of net sales									13.10%	13.60%	13.20%
Operating Segments | Sales | Valve Solutions
Revenue from External Customer [Line Items]
Net sales									$ 156,588	$ 174,515	$ 207,456
Percentage of net sales									26.60%	16.30%	11.90%
Intersegment Eliminations
Revenue from External Customer [Line Items]
Net sales									$ (1,423)	$ (1,325)	$ (2,219)
Intersegment Eliminations | Sales
Revenue from External Customer [Line Items]
Net sales									$ (1,423)	$ (1,325)	$ (2,219)
Percentage of net sales									(0.10%)	(0.10%)	(0.10%)

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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