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Goodwill and Other Intangible Assets - Definite-Lived Intangible Assets by Major Asset Class (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]    
Definite-lived intangible assets, Gross Carrying Amount $ 972,600 $ 972,600
Definite-lived intangible assets, Accumulated Amortization (433,121) (334,510)
Definite-lived intangible assets, Net Carrying Amount 539,479 638,090
Customer Relationships    
Finite Lived Intangible Assets [Line Items]    
Definite-lived intangible assets, Gross Carrying Amount 832,540 832,540
Definite-lived intangible assets, Accumulated Amortization (343,925) (273,799)
Definite-lived intangible assets, Net Carrying Amount 488,615 558,741
Acquired Software    
Finite Lived Intangible Assets [Line Items]    
Definite-lived intangible assets, Gross Carrying Amount 111,200 111,200
Definite-lived intangible assets, Accumulated Amortization (78,831) (53,002)
Definite-lived intangible assets, Net Carrying Amount 32,369 58,198
Other Trade Names    
Finite Lived Intangible Assets [Line Items]    
Definite-lived intangible assets, Gross Carrying Amount 23,900 23,900
Definite-lived intangible assets, Accumulated Amortization (5,405) (3,178)
Definite-lived intangible assets, Net Carrying Amount 18,495 20,722
Non-compete Agreements    
Finite Lived Intangible Assets [Line Items]    
Definite-lived intangible assets, Gross Carrying Amount 2,860 2,860
Definite-lived intangible assets, Accumulated Amortization (2,860) (2,431)
Definite-lived intangible assets, Net Carrying Amount 0 429
Content Library    
Finite Lived Intangible Assets [Line Items]    
Definite-lived intangible assets, Gross Carrying Amount 2,100 2,100
Definite-lived intangible assets, Accumulated Amortization (2,100) (2,100)
Definite-lived intangible assets, Net Carrying Amount $ 0 $ 0