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Summary of Significant Accounting Policies (Asset Retirement Obligation) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Accounting Policies [Abstract]
Retirement obligation	$ 4,650	$ 4,296
Discount rate	6.00%	6.00%
Present value, recorded as a liability	1,807	1,481
Deferred tax	1,242	1,019
Regulatory asset	$ 3,049	$ 2,500

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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