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Unrealized Gain / Loss on Investments (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
May. 31, 2015 | Jun. 30, 2015 | Apr. 30, 2015
CommonWealth REIT (EQC) |  |  |
Unrealized gain on investments |  |  |
Investment in common shares |  |  | 250,000
Proceeds from equity shares sold | $ 6,571 |  |
Realized gain on available for sale equity securities | $ 71 |  |
Five Star |  |  |
Unrealized gain on investments |  |  |
Investment in common shares |  | 4,235,000 |
Quoted market prices (in dollars per share) |  | $ 4.80 |
Weighted average costs (in dollars per share) |  | $ 3.36 |

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