Loans Payable (Details) (USD $)	0 Months Ended	1 Months Ended
	Feb. 28, 2011	Feb. 28, 2011	Aug. 31, 2009	Sep. 30, 2011	Dec. 31, 2010
Loans Payable
Revolving credit facility, term (years)	5
Revolving credit facility, maximum borrowing capacity	$ 100,000,000	$ 100,000,000
Credit agreement potential floating interest rate plus Federal Funds rate	0.50%	0.50%
Revolving credit facility, fees		500,000
Revolving credit facility, amount outstanding				0
Loan, principal amount outstanding			34,000,000
Loan, fixed interest rate			7.03%
Loan, amortization period (years)			25
Incremental interest rate due to default in repayment			5.00%
Loan, outstanding balance				32,897,000
Current portion of loans payable				587,000	521,000
Long-term portion of loans payable				$ 32,310,000	$ 32,730,000