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Summary of Significant Accounting Policies - Recently Adopted Accounting Pronouncements (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Total revenues | $ 35,657 | $ 45,577 | $ 51,147
Gain on sale of real estate | 0 | 1,044 | 0
Excess tax benefit of stock-based compensation | 107 | 0 | 0
Aggregated distributions received from equity method investees | 10,314 |  |
Distribution of earnings from unconsolidated joint ventures | 7,200 | 4,500 | 7,200
Distribution of equity from unconsolidated joint ventures | 3,114 | 1,600 | $ 1,100
Calculated under Revenue Guidance in Effect before Topic 606 | Accounting Standards Update 2014-09 |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Total revenues | 475 | 710 |
Gain on sale of real estate | 411 | 615 |
Calculated under Revenue Guidance in Effect before Topic 606 | Accounting Standards Update 2014-09 | Pro Forma |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Total revenues | 73 | 1,112 |
Gain on sale of real estate | $ 9 | $ 1,017 |

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