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Segment Information - Schedule of Fixed Assets, Goodwill and Intangibles, Net (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment Reporting Information [Line Items]
Fixed assets, net book value	$ 90,413				$ 81,054				$ 90,413	$ 81,054
Intangible Assets, Net (Including Goodwill)	702,055				786,584				702,055	786,584
Services	328,168	$ 283,423	$ 259,678	$ 327,742	381,975	$ 342,907	$ 362,130	$ 328,791	1,199,011	1,415,803	$ 1,475,088
UNITED STATES
Segment Reporting Information [Line Items]
Fixed assets, net book value	80,447				68,497				80,447	68,497
Intangible Assets, Net (Including Goodwill)	614,168				659,584				614,168	659,584
Services									959,636	1,116,045	1,152,399
CANADA
Segment Reporting Information [Line Items]
Fixed assets, net book value	3,461				4,475				3,461	4,475
Intangible Assets, Net (Including Goodwill)	51,267				64,842				51,267	64,842
Services									81,930	105,067	124,001
Other
Segment Reporting Information [Line Items]
Fixed assets, net book value	6,505				8,082				6,505	8,082
Intangible Assets, Net (Including Goodwill)	$ 36,620				$ 62,158				36,620	62,158
Services									$ 157,445	$ 194,691	$ 198,688

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Carrying amount of finite-lived intangible assets, indefinite-lived intangible assets and goodwill. Goodwill is an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized. Intangible assets are assets, not including financial assets, lacking physical substance.

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Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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