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Fixed Assets (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Fixed assets      
Total fixed assets, gross $ 424,485 $ 360,363  
Less: Accumulated depreciation and amortization (159,144) (138,984)  
Fixed assets, net 265,341 221,379  
Interest capitalized costs incurred 3,500 3,400 $ 1,500
Depreciation and amortization expense 21,200 16,800 $ 13,400
Software      
Fixed assets      
Intangible assets, gross 196,139 191,709  
Land, buildings, and building improvements      
Fixed assets      
Tangible fixed assets, gross 121,332 5,068  
Equipment      
Fixed assets      
Tangible fixed assets, gross 37,426 14,546  
Furniture and fixtures      
Fixed assets      
Tangible fixed assets, gross 20,998 1,934  
Leasehold improvements      
Fixed assets      
Tangible fixed assets, gross 1,313 1,313  
Projects in progress      
Fixed assets      
Projects in progress 47,277 22,992  
Construction in progress      
Fixed assets      
Tangible fixed assets, gross $ 0 $ 122,801