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Financing Arrangement - Financing Arrangement Activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Schedule of Joint Ventures [Line Items]
Interest income (expense)	$ 2,762	$ (2,181)	$ (7,407)	$ (4,392)
Joint Venture \| Financing Arrangement
Schedule of Joint Ventures [Line Items]
Distributions of the partner's share of net income	2,464	0	4,466	0
Distributions in excess of the partner's share of net income	1,411	0	3,049	0
Adjustment to fair value of financing arrangement obligation	(8,768)	0	(4,386)	0
Interest income (expense)	$ (4,893)	$ 0	$ 3,129	$ 0