Federal Income Tax Considerations (Components Of Deferred Tax Assets And Liabilities) (Details) (USD $) In Thousands	Jun. 30, 2011	Dec. 31, 2010
Federal Income Tax Considerations
Impairment loss	$ 14,761	$ 13,584
Allowance on other assets	1,443	1,423
Interest expense	8,977	7,256
Net operating loss carryforward	5,119	4,684
Other	1,073	672
Total deferred tax assets	31,373	27,619
Valuation allowance	(19,262)	(15,818)
Total deferred tax assets, net of allowance	12,111	11,801
Straight-line rentals	1,450	1,290
Book-tax basis differential	3,977	4,708
Other	3
Total deferred tax liabilities	$ 5,430	$ 5,998