Shareholders' Equity / Partners' Capital - Noncontrolling Interest Activity in Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Class of Stock [Line Items]
Income (loss) allocated to noncontrolling interest	$ 309	$ 7,316	$ (22)	$ 10,391
Consolidated Subsidiaries With Noncontrolling Interest
Class of Stock [Line Items]
Income (loss) allocated to noncontrolling interest	(31)	(226)	8	(446)
Series C Convertible Units
Class of Stock [Line Items]
Income (loss) allocated to noncontrolling interest	0	0	0	3,027
Class A Units
Class of Stock [Line Items]
Income (loss) allocated to noncontrolling interest	340	(27)	(30)	108
Series D Convertible Units
Class of Stock [Line Items]
Income (loss) allocated to noncontrolling interest	0	0	0	133
Beneficial conversion feature	$ 0	$ 7,569	$ 0	$ 7,569