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Property And Equipment (Schedule Of Asset Retirement Obligation) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]
Asset retirement obligation, beginning of period			$ 13,275	$ 12,653
Liabilities incurred			1,771	1,711
Liabilities settled			(807)	(1,002)
Accretion expense	180	176	529	529
Asset retirement obligation as of end of period	14,768	13,891	14,768	13,891
Less current portion	780	60	780	60	60
Asset retirement obligation, long-term	$ 13,988	$ 13,831	$ 13,988	$ 13,831	$ 13,215

The carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees.

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- Definition

Amount of accretion expense recognized during the period that is associated with an asset retirement obligation. Accretion expense measures and incorporates changes due to the passage of time into the carrying amount of the liability.

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