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Shareholders' Equity / Partners' Capital - Noncontrolling Interest Reflected in Consolidated Statement of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Class of Stock [Line Items]
Noncontrolling interest	$ 4,165	$ (4,507)	$ 3,751
Consolidated Subsidiaries With Noncontrolling Interest
Class of Stock [Line Items]
Noncontrolling interest	(259)	141	(562)
Series C Convertible Units
Class of Stock [Line Items]
Noncontrolling interest	0	0	3,027
Class A Units
Class of Stock [Line Items]
Noncontrolling interest	4,424	(4,648)	(6,417)
Series D Convertible Units
Class of Stock [Line Items]
Noncontrolling interest	0	0	134
Noncontrolling interest, beneficial conversion feature	$ 0	$ 0	$ 7,569

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