Supplemental Disclosure of Cash Flow Information - Notes Receivable (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Supplemental Cash Flow Elements [Abstract]
Other assets, net	$ 6,566	$ 0
Noncontrolling interest	(6,566)	0
Net	$ 0	$ 0