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Shareholders' Equity / Partners' Capital - Noncontrolling Interest Activity in Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
Class of Stock [Line Items] |  |  |  |
Income (loss) allocated to noncontrolling interest | $ (3,150) | $ (30) | $ (2,036) | $ (331)
Consolidated Subsidiaries With Noncontrolling Interest |  |  |  |
Class of Stock [Line Items] |  |  |  |
Income (loss) allocated to noncontrolling interest | (248) | 1 | (259) | 39
Class A Units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Income (loss) allocated to noncontrolling interest | $ (2,902) | $ (31) | $ (1,777) | $ (370)

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