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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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