Unrealized Loss on Investments (Details) (USD $)	9 Months Ended
	Sep. 30, 2011
CommonWealth REIT (CWH)
Unrealized loss on investments
Investment in common shares (in shares)	250,000
Quoted market prices (in dollars per share)	$ 18.97
Weighted average costs (in dollars per share)	$ 26.00
Five Star
Unrealized loss on investments
Investment in common shares (in shares)	4,235,000
Quoted market prices (in dollars per share)	$ 2.50
Weighted average costs (in dollars per share)	$ 3.36