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Property and Equipment (Property and Equipment) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 579,637 $ 548,661
Accumulated depreciation and amortization (225,969) (214,998)
Property and equipment, net 353,668 333,663
Land and Land Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 70,960 71,061
Buildings and Leasehold Improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 311,409 305,277
Furniture, Fixtures and Equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 92,805 92,360
Software [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross 72,721 70,003
Assets Under Development [Member]    
Property, Plant and Equipment [Line Items]    
Property and equipment, gross $ 31,742 $ 9,960