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Investments in and Advances to Equity Method Investees (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
(Gain) loss from equity method investees	$ (63)	$ 13,717	$ (12,725)	$ (11,014)
Equity Method Investee | Services Agreements
Schedule of Equity Method Investments [Line Items]
Income from long-term services agreement	$ 4,000	$ 65,900	$ 12,600	$ 197,200
Minimum
Schedule of Equity Method Investments [Line Items]
Economic interest percentage	4.00%		4.00%		4.00%
Voting interest percentage	25.00%		25.00%		25.00%
Maximum
Schedule of Equity Method Investments [Line Items]
Economic interest percentage	39.00%		39.00%		38.00%
Voting interest percentage	40.00%		40.00%		40.00%

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