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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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