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Income taxes, Components of the provisions for income taxes (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Line Items]        
Federal corporate tax rate   35.00%    
Provisional tax benefit   $ (13,400)    
Estimated undistributed foreign E&P   95,400    
Provisional tax expense   $ 13,600    
U.S. federal cash taxes on deemed mandatory repatriation period   8 years    
Current [Abstract]        
Federal   $ 29,441 $ 29,244 $ 38,957
State   2,983 2,331 2,221
International   356 1,002 2,029
Total current   32,780 32,577 43,207
Deferred [Abstract]        
Federal   (6,045) 9,979 (119)
State   (592) (272) (111)
International   9,896 (5,587) 1,323
Total deferred   3,259 4,120 1,093
Total provision for income taxes   $ 36,039 $ 36,697 $ 44,300
Forecast [Member]        
Income Tax Disclosure [Line Items]        
Federal corporate tax rate 21.00%