Fair Value of Financial Instruments - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Schedule of Equity Method Investments [Line Items]
Contributions to equity method investment	$ 6,245	$ 15,611	$ 33,588
Income from equity method investments	4,568	3,065	$ 875
RECOP I
Schedule of Equity Method Investments [Line Items]
Contributions to equity method investment	6,300	15,600
Proceeds received on distributions	3,200	1,700
Income from equity method investments	$ 3,700	$ 2,300