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Property and equipment, net (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]      
Total cost $ 1,640,744 $ 1,438,991  
Total accumulated depreciation (679,758) (582,799)  
Property and equipment, net 960,986 856,192  
Depreciation expense 111,638 94,490 $ 89,085
Land      
Property, Plant and Equipment [Line Items]      
Total cost 146,517 142,262  
Buildings and leasehold improvements      
Property, Plant and Equipment [Line Items]      
Total cost 710,046 623,612  
Equipment      
Property, Plant and Equipment [Line Items]      
Total cost $ 784,181 $ 673,117