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Income taxes (Income Tax Rate Reconciliation) (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 Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]                      
Income tax expense at the statutory rate                 $ 65,129 $ 77,978 $ 49,246
State taxes, net of federal tax benefit                 3,428 3,847 3,193
Non-U.S. operations                 (6,908) (7,363) (4,495)
Domestic incentives                 (2,544) (2,202) (1,179)
Prior year federal, non-U.S. and state tax                 (4,059) (1,736) (169)
Nondeductible expenses                 1,341 666 758
Other                 91 75 (244)
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
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]                      
Income tax expense at the statutory rate                 35.00% 35.00% 35.00%
State taxes, net of federal tax benefit                 1.90% 1.70% 2.30%
Non-U.S. operations                 (3.70%) (3.30%) (3.20%)
Domestic incentives                 (1.40%) (1.00%) (0.80%)
Prior year federal, non-U.S. and state tax                 (2.20%) (0.80%) (0.10%)
Nondeductible expenses                 0.70% 0.30% 0.50%
Other                 0.10% 0.10% (0.20%)
Effective income tax rate                 30.40% 32.00% 33.50%