Income Taxes (Deferred Tax Assets And Deferred Tax Liabilities Arises Due To Temporary Differences) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Income Taxes [Abstract]
Reserve for receivables, current	$ 258	$ 218
Accrued liabilities and inventory reserves, current	5,069	3,813
Net operating loss carryforward, current	3,614	375
Unrealized losses on interest rate swap contracts, current	12,197	8,677
Other, current	261	258
Subtotal, current	21,399	13,341
Valuation allowance	(158)	(86)
Current deferred tax assets	21,241	13,255
Net operating loss carryforward, non-current	17,350	4,434
Unrealized loss on derivative instruments, non-current	13,548	32,916
Stock-based compensation, non-current	6,111	4,819
Asset retirement obligations, non-current	2,434	4,963
Tangible and intangible assets, non-current	15,970	24,065
Deferred revenue, non-current	798	138
Other, non-current	3,635	1,598
Subtotal, non-current	59,846	72,933
Valuation allowance	(11,908)	(10,477)
Non-current deferred tax assets	47,938	62,456
Other, current	(1,190)	(1,348)
Current deferred tax liabilities	(1,190)	(1,348)
Tangible and intangible assets, non-current	(41,303)	(33,441)
Asset retirement obligations, non-current	(2,625)	(2,729)
Non-current deferred tax liability	(43,928)	(36,170)
Net deferred tax asset	$ 24,061	$ 38,193