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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating losses | $ (27,845) | $ (23,268) | $ (61,364) | $ (54,654)
Taxable REIT Subsidiaries |  |  |  |
Operating Loss Carryforwards [Line Items] |  |  |  |
Net operating losses |  |  | $ 4,800 |

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