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Income taxes (Schedule of Components of Income Tax Expense (Benefit)) (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
Current                      
U.S. Federal and state                 $ 20,589 $ 55,591 $ 34,351
Non-U.S.                 20,748 22,023 14,241
Total current                 41,337 77,614 48,592
Deferred                      
U.S. Federal and state                 16,317 (4,788) 386
Non-U.S.                 (1,176) (1,561) (1,868)
Total deferred                 15,141 (6,349) (1,482)
Provision for income tax expense $ 14,107 $ 13,924 $ 13,068 $ 15,379 $ 10,033 $ 17,605 $ 21,742 $ 21,885 $ 56,478 $ 71,265 $ 47,110