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Income taxes (Schedule of Components of Income Tax Expense (Benefit)) (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
Current |  |  |  |  |  |  |  |  |  |  |
U.S. Federal and state |  |  |  |  |  |  |  |  | $ (38,589) | $ 43 | $ 47,100
Non-U.S. |  |  |  |  |  |  |  |  | 6,956 | 8,264 | 24,315
Total current |  |  |  |  |  |  |  |  | (31,633) | 8,307 | 71,415
Deferred |  |  |  |  |  |  |  |  |  |  |
U.S. Federal and state |  |  |  |  |  |  |  |  | (18,290) | (19,071) | (2,080)
Non-U.S. |  |  |  |  |  |  |  |  | (6,128) | (4,175) | (1,190)
Total deferred |  |  |  |  |  |  |  |  | (24,418) | (23,246) | (3,270)
Provision for income tax expense (benefit) | $ (12,677) | $ (11,821) | $ (21,147) | $ (10,406) | $ (28,387) | $ 932 | $ 1,911 | $ 10,605 | $ (56,051) | $ (14,939) | $ 68,145

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