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Property and Equipment (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Property, Plant and Equipment [Line Items]          
Property and equipment, gross $ 311,049   $ 311,049   $ 283,152
Accumulated depreciation (182,522)   (182,522)   (159,625)
Property and equipment, net 128,527   128,527   123,527
Depreciation 12,000 $ 22,000 23,800 $ 42,300  
Computer equipment and software          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 207,206   $ 207,206   172,664
Computer equipment and software | Minimum          
Property, Plant and Equipment [Line Items]          
Useful life     1 year    
Computer equipment and software | Maximum          
Property, Plant and Equipment [Line Items]          
Useful life     5 years    
Building and building improvements          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 54,545   $ 54,545   52,444
Building and building improvements | Minimum          
Property, Plant and Equipment [Line Items]          
Useful life     5 years    
Building and building improvements | Maximum          
Property, Plant and Equipment [Line Items]          
Useful life     48 years    
Office furniture and equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 23,243   $ 23,243   21,899
Office furniture and equipment | Minimum          
Property, Plant and Equipment [Line Items]          
Useful life     1 year    
Office furniture and equipment | Maximum          
Property, Plant and Equipment [Line Items]          
Useful life     10 years    
Leasehold improvements          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 9,387   $ 9,387   9,168
Leasehold improvements | Minimum          
Property, Plant and Equipment [Line Items]          
Useful life     1 year    
Leasehold improvements | Maximum          
Property, Plant and Equipment [Line Items]          
Useful life     15 years    
Transportation equipment          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 4,857   $ 4,857   4,857
Transportation equipment | Minimum          
Property, Plant and Equipment [Line Items]          
Useful life     5 years    
Transportation equipment | Maximum          
Property, Plant and Equipment [Line Items]          
Useful life     10 years    
Land          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross 3,642   $ 3,642   3,642
Construction in progress          
Property, Plant and Equipment [Line Items]          
Property and equipment, gross $ 8,169   $ 8,169   $ 18,478