Equity Method Investments - Activity Related to Equity Method Investments (Details) - USD ($) $ in Thousands	3 Months Ended				12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity Method Investments
Balance at beginning of period				$ 163,181	$ 0	$ 163,181	$ 86,077
Contributions					35	9,338	77,263
Distributions					0	(17,453)	(1,296)
(Loss) earnings on equity method investments	$ 69,302	$ 3,860	$ 3,650	3,684	(59)	80,496	1,137
Reclassification of accumulated losses					0	9,400	0
Sale of investment					24	(244,962)	0
Balance at end of period	0				0	0	163,181
Constitution
Equity Method Investments
Balance at beginning of period				0	0	0	732
Contributions					35	725	500
Distributions					0	0	0
(Loss) earnings on equity method investments					(35)	(10,125)	(1,232)
Reclassification of accumulated losses					0	9,400	0
Sale of investment					0	0	0
Balance at end of period	0				0	0	0
Meade
Equity Method Investments
Balance at beginning of period				$ 163,181	0	163,181	85,345
Contributions					0	8,613	76,763
Distributions					0	(17,453)	(1,296)
(Loss) earnings on equity method investments					(24)	90,621	2,369
Reclassification of accumulated losses					0	0	0
Sale of investment					24	(244,962)	0
Balance at end of period	$ 0				$ 0	$ 0	$ 163,181