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Property and Equipment (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Property and Equipment    
Property and equipment $ 200,433 $ 200,728
Less accumulated depreciation and amortization (84,194) (89,689)
Property and equipment, net 116,239 111,039
Land [Member]    
Property and Equipment    
Property and equipment 5,579 5,579
Land Improvements [Member]    
Property and Equipment    
Property and equipment 2,242 2,242
Buildings [Member]    
Property and Equipment    
Property and equipment 51,398 51,409
Buildings and Leasehold Improvements [Member]    
Property and Equipment    
Property and equipment 11,070 9,581
Computer Equipment [Member]    
Property and Equipment    
Property and equipment 88,131 85,316
Furniture, Fixtures and Equipment [Member]    
Property and Equipment    
Property and equipment 8,066 4,955
Internally Developed Software [Member]    
Property and Equipment    
Property and equipment 31,829 39,270
Construction in Progress [Member]    
Property and Equipment    
Property and equipment $ 2,118 $ 2,376