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Goodwill and intangible assets (Schedule of Goodwill) (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012
Goodwill [Roll Forward] |  |
Goodwill Balance at January 1, net | $ 695,799,000 | $ 600,827,000
Acquisition | 100,257,000 | 85,092,000
Purchase accounting adjustment | 97,000 | 1,379,000
Impact of non-U.S. local currency translation | 6,165,000 | 8,501,000
Goodwill Balance at December 31, net | 802,318,000 | 695,799,000
Accumulated impairment losses on goodwill | 40,000,000 | 40,000,000
Drilling & Subsea [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill Balance at January 1, net | 616,520,000 | 523,019,000
Acquisition | 100,257,000 | 85,092,000
Purchase accounting adjustment | 97,000 | 0
Impact of non-U.S. local currency translation | 6,481,000 | 8,409,000
Goodwill Balance at December 31, net | 723,355,000 | 616,520,000
Production & Infrastructure [Member] |  |
Goodwill [Roll Forward] |  |
Goodwill Balance at January 1, net | 79,279,000 | 77,808,000
Acquisition | 0 | 0
Purchase accounting adjustment | 0 | 1,379,000
Impact of non-U.S. local currency translation | (316,000) | 92,000
Goodwill Balance at December 31, net | $ 78,963,000 | $ 79,279,000

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