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Goodwill and Other Intangible Assets - Definite-Lived Intangible Assets by Major Asset Class (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Finite Lived Intangible Assets [Line Items] |  |
Definite-lived intangible assets, Gross Carrying Amount | $ 972,600 | $ 900,700
Definite-lived intangible assets, Accumulated Amortization | (334,510) | (243,520)
Definite-lived intangible assets, Net Carrying Amount | 638,090 | 657,180
Customer Relationships |  |
Finite Lived Intangible Assets [Line Items] |  |
Definite-lived intangible assets, Gross Carrying Amount | 832,540 | 814,240
Definite-lived intangible assets, Accumulated Amortization | (273,799) | (205,190)
Definite-lived intangible assets, Net Carrying Amount | 558,741 | 609,050
Acquired Software |  |
Finite Lived Intangible Assets [Line Items] |  |
Definite-lived intangible assets, Gross Carrying Amount | 111,200 | 71,700
Definite-lived intangible assets, Accumulated Amortization | (53,002) | (33,826)
Definite-lived intangible assets, Net Carrying Amount | 58,198 | 37,874
Other Trade Names |  |
Finite Lived Intangible Assets [Line Items] |  |
Definite-lived intangible assets, Gross Carrying Amount | 23,900 | 9,800
Definite-lived intangible assets, Accumulated Amortization | (3,178) | (1,157)
Definite-lived intangible assets, Net Carrying Amount | 20,722 | 8,643
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 | (2,431) | (1,859)
Definite-lived intangible assets, Net Carrying Amount | 429 | 1,001
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) | (1,488)
Definite-lived intangible assets, Net Carrying Amount |  | $ 612

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