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Federal Income Tax Considerations (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2011	Dec. 31, 2010
Federal Income Tax Considerations [Abstract]
Required distribution percentage to maintain REIT status	90.00%
Deferred tax assets	$ 11,368	$ 11,801
Impairment loss	20,758	13,584
Valuation allowance	$ 28,686	$ 15,818

The tax effect as of the balance sheet date of the amount of the amount of the estimated future tax deductions arising from estimated impairment losses, which can only be deducted for tax purposes when impaired assets are sold or otherwise disposed of, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

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