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Equity Method Investments - Narrative (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019
Schedule of Equity Method Investments [Line Items]
Earnings from equity method investments	$ 22,195,000	$ 9,518,000	$ 61,944,000	$ 25,959,000
Equity method investments	$ 2,884,000		$ 2,884,000				$ 7,692,000
Tinuum Group, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest, percent	42.50%		42.50%				42.50%
Earnings from equity method investments	$ 19,975,000	7,260,000	$ 55,462,000	20,462,000
Equity method investments	$ 0	17,516,000	$ 0	17,516,000	$ 0	$ 0	$ 3,387,000	$ 18,118,000	$ 24,954,000	$ 32,280,000
Tinuum Services, LLC
Schedule of Equity Method Investments [Line Items]
Ownership interest, percent	50.00%		50.00%				50.00%
Earnings from equity method investments	$ 2,223,000	2,257,000	$ 6,485,000	5,498,000
Equity method investments	2,824,000		2,824,000				$ 4,242,000
Equity Method Investment | Tinuum Group, LLC
Schedule of Equity Method Investments [Line Items]
Loss attributable to noncontrolling interest	(34,551,000)	(25,023,000)	(99,167,000)	(63,117,000)
Equity Method Investment | Tinuum Services, LLC
Schedule of Equity Method Investments [Line Items]
Loss attributable to noncontrolling interest	$ (63,977,000)	$ (70,075,000)	$ (215,779,000)	$ (209,118,000)

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