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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, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Class of Stock [Line Items] |  |  |  |
Income (loss) allocated to noncontrolling interest | $ 2,881 | $ 309 | $ 845 | $ (22)
Consolidated Subsidiaries With Noncontrolling Interest |  |  |  |
Class of Stock [Line Items] |  |  |  |
Income (loss) allocated to noncontrolling interest | 0 | (31) | (259) | 8
Class A Units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Income (loss) allocated to noncontrolling interest | $ 2,881 | $ 340 | $ 1,104 | $ (30)

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