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Income taxes (Schedule of Income before Income Tax, Domestic and Foreign) (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
Income Tax Disclosure [Abstract]                      
U.S.                 $ 108,680 $ 140,179 $ 88,968
Non-U.S.                 77,402 82,616 51,735
Income before income taxes $ 48,652 $ 47,105 $ 43,008 $ 47,317 $ 33,971 $ 58,548 $ 65,880 $ 64,396 $ 186,082 $ 222,795 $ 140,703