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Supplemental Financial Information (Narrative) (Details)	12 Months Ended
	Dec. 31, 2011
Schedule Of Supplemental Financial Information [Line Items]
Senior subordinated notes, interest rate	8.00%
Senior Subordinated 8% Notes, Due December 1, 2015 [Member]
Schedule Of Supplemental Financial Information [Line Items]
Senior subordinated notes, interest rate	8.00%
Senior subordinated notes, maturity date	December 1, 2015

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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