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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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