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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
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

X

- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 30
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 928
-SubTopic 340
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6473545&loc=d3e61844-108004

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+ References

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