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Shareholders' Equity - Noncontrolling Interest Activity in Condensed Consolidated Statements of Operations (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Class of Stock [Line Items] |  |  |  |
Income (loss) allocated to noncontrolling interest | $ (30) | $ (761) | $ (331) | $ 3,075
Consolidated Subsidiaries With Noncontrolling Interest |  |  |  |
Class of Stock [Line Items] |  |  |  |
Income (loss) allocated to noncontrolling interest | 1 | (145) | 39 | (220)
Series C Convertible Units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Income (loss) allocated to noncontrolling interest | 0 | 0 | 0 | 3,027
Class A Units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Income (loss) allocated to noncontrolling interest | (31) | (616) | (370) | 134
Series D Convertible Units |  |  |  |
Class of Stock [Line Items] |  |  |  |
Income (loss) allocated to noncontrolling interest | $ 0 | $ 0 | $ 0 | $ 134

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