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Property and Equipment (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Property and Equipment            
Property and Equipment, gross $ 349,394 $ 337,190        
Less: Accumulated depreciation (237,569) (178,985)        
Property and equipment, net 111,825 158,205   $ 171,548 $ 170,507 $ 165,620
Depreciation expense 57,000 51,800 $ 42,700      
Computer hardware            
Property and Equipment            
Property and Equipment, gross 250,453 242,739        
Computer software            
Property and Equipment            
Property and Equipment, gross 62,335 47,828        
Construction in-progress            
Property and Equipment            
Property and Equipment, gross 471 14,854        
Furniture and fixtures            
Property and Equipment            
Property and Equipment, gross 7,736 5,981        
Building            
Property and Equipment            
Property and Equipment, gross 8,808 8,808        
Leasehold improvements            
Property and Equipment            
Property and Equipment, gross $ 19,591 $ 16,980