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Business segments (Revenue by Product Lines) (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 393,733 | $ 390,192 | $ 367,887 | $ 372,999 | $ 330,165 | $ 347,767 | $ 373,512 | $ 363,489 | $ 1,524,811 | $ 1,414,933 | $ 1,128,131
Sales [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,524,811 | 1,414,933 | 1,128,131
Revenue, Percentage |  |  |  |  |  |  |  |  | 100.00% | 100.00% | 100.00%
Sales [Member] | Drilling Technologies [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 462,420 | 434,240 | 372,046
Revenue, Percentage |  |  |  |  |  |  |  |  | 30.30% | 30.70% | 33.00%
Sales [Member] | Subsea Technologies [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 316,418 | 250,554 | 220,944
Revenue, Percentage |  |  |  |  |  |  |  |  | 20.80% | 17.70% | 19.60%
Sales [Member] | Downhole Technologies [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 161,970 | 141,706 | 66,440
Revenue, Percentage |  |  |  |  |  |  |  |  | 10.60% | 10.00% | 5.90%
Sales [Member] | Production Equipment [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 251,428 | 227,286 | 178,110
Revenue, Percentage |  |  |  |  |  |  |  |  | 16.50% | 16.10% | 15.80%
Sales [Member] | Valve Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 211,170 | 210,608 | 173,836
Revenue, Percentage |  |  |  |  |  |  |  |  | 13.80% | 14.90% | 15.40%
Sales [Member] | Flow Equipment [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 122,896 | 151,310 | 116,755
Revenue, Percentage |  |  |  |  |  |  |  |  | 8.10% | 10.70% | 10.30%
Sales [Member] | Eliminations [Member] |  |  |  |  |  |  |  |  |  |  |
Revenue from External Customer [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ (1,491) | $ (771) | $ 0
Revenue, Percentage |  |  |  |  |  |  |  |  | (0.10%) | (0.10%) | 0.00%

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