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Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 410,261 $ 369,892  
Less: accumulated depreciation (179,920) (133,835)  
Property and equipment, net 230,341 236,057  
Depreciation, Nonproduction 44,500 26,600 $ 16,100
Land      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 33,700 30,364  
Buildings      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross 63,016 55,137  
Furniture, fixtures, equipment and leasehold improvements      
Property, Plant and Equipment [Line Items]      
Property and equipment, gross $ 313,545 $ 284,391