Income Tax Considerations (Schedule Of Deferred Tax Assets And Liabilities) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Deferred tax assets:
Impairment loss	$ 13,476	$ 13,538
Allowance on other assets	117	100
Interest expense	9,246	11,707
Net operating loss carryforwards	8,413	10,071
Straight-line rentals	813	337
Book-tax basis differential	4,380	3,777
Other	348	421
Total deferred tax assets	36,793	39,951
Valuation allowance	(25,979)	(27,230)
Total deferred tax assets, net of allowance	10,814	12,721
Deferred tax liabilities:
Book-tax basis differential (1)	10,998	7,205
Other	553	333
Total deferred tax liabilities	11,551	$ 7,538
Net operating loss carryforwards	$ 23,700