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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, 2017	Dec. 31, 2016	Dec. 31, 2015
Class of Stock [Line Items]
Noncontrolling interest	$ (4,507)	$ 3,751	$ 14,353
Consolidated Subsidiaries With Noncontrolling Interest
Class of Stock [Line Items]
Noncontrolling interest	141	(562)	(157)
Series C Convertible Units
Class of Stock [Line Items]
Noncontrolling interest	0	3,027	18,792
Class A Units
Class of Stock [Line Items]
Noncontrolling interest	(4,648)	(6,417)	(4,282)
Series D Convertible Units
Class of Stock [Line Items]
Noncontrolling interest	0	134	0
Noncontrolling interest, beneficial conversion feature	$ 0	$ 7,569	$ 0

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Amount of Net Income (Loss) attributable to noncontrolling interest.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 55
-Paragraph 4J
-URI http://asc.fasb.org/extlink&oid=84234705&loc=SL4591551-111686

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 810
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (a)(2)
-URI http://asc.fasb.org/extlink&oid=84161450&loc=SL4573702-111684

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