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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