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Cost and Fair Value Basis of Long-Term Debt (details) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011	Dec. 31, 2010	Jun. 30, 2010
Long Term Debt By Maturity Abstract
Long Term Debt Maturities Repayment Terms	Our long-term debt consists of secured medium-term notes (MTNs) with maturity dates from 2012 through 2035, interest rates ranging from 3.95 percent to 9.05 percent, and a weighted-average coupon rate of 6.16 percent. For the six months ended June 30, 2011, we redeemed $10 million of MTNs.
Mediumterm Notes Abstract
Carrying Amount	$ 591,700	$ 601,700	$ 636,700
Estimated Fair Value	$ 678,281	$ 690,126	$ 728,172

Disclosure of timing of required repayments, sinking fund requirements, and other redeemable securities at fixed or determinable prices and dates in the five years immediately following the date of the latest balance sheet presented in the financial statements, and the amount thereafter to fully repay the principal of long-term debt. These disclosures may be made either on an individual debt or security basis, by type of debt or security basis, or on a combined basis.

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- Definition

Including the current and noncurrent portions, carrying value at the balance sheet date of a financial instrument used to receive debt funding on a regular basis with original maturities ranging from 5-10 years.

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