Non-controlling Interests - Changes in Ownership (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2017
Noncontrolling Interest [Abstract]
Decrease in additional paid-in capital as a result of the Organizational Transactions	$ (174,255)	$ (174,255)
Increase in additional paid-in capital as a result of adjustments to the non-controlling interests	846	846
Total transfers to non-controlling interests	$ (173,409)	$ (173,409)