Federal Income Tax Considerations (Components Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Federal Income Tax Considerations [Abstract]
Impairment loss	$ 20,758	$ 13,584
Allowance on other assets	1,449	1,423
Interest expense	10,259	7,256
Net operating loss carryforward	6,229	4,684
Other	1,359	672
Total deferred tax assets	40,054	27,619
Valuation allowance	(28,686)	(15,818)
Total deferred tax assets, net of allowance	11,368	11,801
Straight-line rentals	1,550	1,290
Book-tax basis differential	3,188	4,708
Other	2
Total deferred tax liabilities	$ 4,740	$ 5,998