Income Taxes (Deferred Tax Assets And Deferred Tax Liabilities Arises Due To Temporary Differences) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Income Taxes [Abstract]
Reserve for receivables, current	$ 105	$ 195
Accrued liabilities and inventory reserves, current	5,136	3,018
Net operating loss carryforward, current	13,664	4,493
Unrealized losses on interest rate swap contracts, current	8,177	7,371
Other, current	72	124
Subtotal, current	27,154	15,201
Valuation allowance	(84)	(83)
Current deferred tax assets	27,070	15,118
Net operating loss carryforward, non-current	8,349	2,353
Unrealized loss on derivative instruments, non-current	18,763	6,879
Stock-based compensation, non-current	2,902	2,671
Asset retirement obligations, non-current	3,956	1,032
Tangible and intangible assets, non-current	23,468	8,732
Deferred revenue, non-current	605	1,189
Other, non-current	886	1,133
Subtotal, non-current	58,929	23,989
Valuation allowance	(8,623)	(7,092)
Non-current deferred tax assets, non-current	50,306	16,897
Other, current	(1,095)	(816)
Current deferred tax liabilities	(1,095)	(816)
Tangible and intangible assets, non-current	(17,633)	(18,306)
Deployment costs, non-current	(6,580)	(6,562)
Asset retirement obligations, non-current	(1,997)	(1,047)
Other, non-current	(995)	(535)
Non-current deferred tax liabilities	(27,205)	(26,450)
Net deferred tax asset	$ 49,076	$ 4,749