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Property and Equipment, Net (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Total cost $ 1,434,830 $ 1,314,546  
Total accumulated depreciation (544,094) (466,580)  
Property, Plant and Equipment, Net, Total 890,736 847,966  
Total depreciation expense 89,085 83,993 $ 96,383
Land [Member]      
Property, Plant and Equipment [Line Items]      
Total cost 158,634 145,417  
Buildings And Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Total cost 633,747 605,156  
Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Total cost $ 642,449 $ 563,973