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Summary of Significant Accounting Policies - Investments (Details) - USD ($) $ / shares in Units, $ in Thousands | 6 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Investment in available for sale securities |  |  |  |
Fair value of the investments in available for sale securities |  | $ 51,472 | $ 23,993 |
CommonWealth REIT (EQC) |  |  |  |
Investment in available for sale securities |  |  |  |
Investment in common shares |  |  | 250,000 |
Proceeds from equity shares sold | $ 6,571 |  |  |
Realized gain on available for sale equity securities | $ 71 |  |  |
Five Star |  |  |  |
Investment in available for sale securities |  |  |  |
Investment in common shares |  | 4,235,000 | 4,235,000 |
Percentage of common shares owned |  | 8.60% | 8.60% |
Weighted average quoted market prices (in dollars per share) |  | $ 3.18 | $ 3.36 |
Fair value of the investments in available for sale securities |  | $ 13,467 | $ 17,575 |
Unrealized loss |  |  | $ 747 |
Unrealized gain |  |  |  | $ 3,361
The RMR Group Inc |  |  |  |
Investment in available for sale securities |  |  |  |
Amount of investment acquired |  | $ 69,826 |  |
Weighted average quoted market prices (in dollars per share) |  | $ 14.41 |  |
Fair value of the investments in available for sale securities |  | $ 38,005 |  |
Unrealized loss |  | $ 31,821 |  |
The RMR Group Inc | Class A common shares |  |  |  |
Investment in available for sale securities |  |  |  |
Investment in common shares |  | 2,637,408 |  |

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