Financing Arrangement - Financing Arrangement Activity (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Schedule of Joint Ventures [Line Items]
Interest income (expense)	$ (36,059)	$ 1,074	$ (59,749)	$ 8,481
Joint Venture | Financing Arrangement
Schedule of Joint Ventures [Line Items]
Distributions of the partner's share of net income	1,278	2,111	5,157	6,577
Distributions in excess of the partner's share of net income	2,118	1,754	6,071	4,803
Adjustment to fair value of financing arrangement obligation	(39,455)	(4,893)	(70,977)	(9,279)
Interest income (expense)	$ (36,059)	$ (1,028)	$ (59,749)	$ 2,101