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Unrealized Gain on Investments (Details) (USD $) In Thousands, except Share data | 1 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2011 | Jun. 30, 2011
CommonWealth REIT (CWH) |  |
Unrealized gain on investments |  |
Investment in common shares (in shares) | 250,000 | 250,000
Quoted market prices (in dollars per share) | $ 25.84 | $ 25.84
Weighted average costs (in dollars per share) |  | $ 26.00
Five Star |  |
Unrealized gain on investments |  |
Shares of common stock acquired in public offering (in shares) | 1,000,000 |
Shares of common stock to be issued under public offering (in shares) | 11,500,000 |
Aggregate purchase price of shares of common stock acquired in public offering | $ 5,000 |
Investment in common shares (in shares) | 4,235,000 | 4,235,000
Quoted market prices (in dollars per share) | $ 5.81 | $ 5.81
Weighted average costs (in dollars per share) |  | $ 3.36

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