Income Taxes (Components Of Net Deferred Income Tax Asset And Liability) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Current deferred tax assets, Allowance for doubtful accounts	$ 9	$ 70
Current deferred tax assets, Deferred revenue	18,207	23,522
Current deferred tax assets, Accrued liabilities	2,885	720
Current deferred tax assets, Valuation allowance	(20,962)	(24,268)
Current deferred tax assets, Total current deferred tax assets, net	139	44
Noncurrent deferred tax assets, Net operating losses	402,392	385,516
Noncurrent deferred tax assets, Property, equipment & intangible basis differences	27,849	29,463
Noncurrent deferred tax assets, Accrued liabilities	10,166	8,640
Noncurrent deferred tax assets, Straight-line rents	8,090	9,100
Noncurrent deferred tax assets, Non-cash compensation	7,437	6,162
Noncurrent deferred tax assets, Other	2,741	2,877
Total noncurrent deferred tax assets	458,675	441,758
Noncurrent deferred tax liabilities, Property, equipment & intangible basis differences	(300,432)	(327,339)
Noncurrent deferred tax liabilities, Convertible debt instruments	(3,823)	(5,117)
Noncurrent deferred tax liabilities, Early extinguishment of debt	(610)
Noncurrent deferred tax liabilities, Other	(4,887)	(3,403)
Noncurrent deferred tax liabilities, Valuation allowance	(154,886)	(113,490)
Total noncurrent deferred tax liabilities, net	$ (5,963)	$ (7,591)