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Income taxes - Income Tax Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax Disclosure [Abstract]      
Current Federal Tax Expense (Benefit) $ 18,548 $ 55,846 $ 28,856
Current State and Local Tax Expense (Benefit) 3,007 6,075 1,634
Current Foreign Tax Expense (Benefit) 6,539 8,219 8,058
Current Income Tax Expense (Benefit) 28,094 70,140 38,548
Deferred Federal Income Tax Expense (Benefit) (11,211) (13,551) (7,268)
Deferred State and Local Income Tax Expense (Benefit) (204) (3,369) (861)
Deferred Foreign Income Tax Expense (Benefit) (225) (333) 332
Deferred income taxes (11,640) (17,253) (7,797)
Income tax expense 16,454 $ 52,887 $ 30,751
Increase (Decrease) in Income Taxes $ (36,400)