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Property and equipment, net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]      
Total cost $ 1,438,991 $ 1,434,830  
Total accumulated depreciation (582,799) (544,094)  
Property and equipment, net 856,192 890,736  
Total depreciation expense 94,490 89,085 $ 83,993
Land      
Property, Plant and Equipment [Line Items]      
Total cost 142,262 158,634  
Buildings and leasehold improvements      
Property, Plant and Equipment [Line Items]      
Total cost 623,612 633,747  
Equipment      
Property, Plant and Equipment [Line Items]      
Total cost $ 673,117 $ 642,449