Financing Arrangement - Financing Arrangement Activity (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Distributions of the partner's share of net income
Total incurred interest (income) expense		$ (62,517)	$ 6,883	$ 8,731
Financing arrangement | Joint venture
Distributions of the partner's share of net income
Distributions of the partner's share of net income	$ 7,184		9,079
Distributions in excess of the partner's share of net income	6,939		6,376
Adjustment to fair value of financing arrangement obligation	(76,640)		(15,225)
Total incurred interest (income) expense	$ (62,517)	$ (62,517)	$ 230