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Subsequent Events (Details) (USD $)	12 Months Ended
Subsequent Events (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Subsequent Event [Line Items]
Repurchased Subsidiary Debt		$ 198,500,000
Repayments of Secured Debt	0	130,798,000	0
Gain on repurchase of long-term debt	0	65,565,000	0
Repayment Of Debt [Member]
Subsequent Event [Line Items]
Repurchased Subsidiary Debt	160,000,000
Repayments of Secured Debt	112,000,000
Gain on repurchase of long-term debt	46,500,000
SubsequentEventsDate	Jan. 17, 2013
Repurchase Of Equity [Member]
Subsequent Event [Line Items]
StockRepurchaseProgramAuthorizedAmount	$ 200,000,000
SubsequentEventsDate	Jan. 24, 2013

Amount represents the difference between the fair value of the payments made and the carrying amount of the debt at the time of its extinguishment.

The cash outflow to repay long-term debt that is wholly or partially secured by collateral. Excludes repayments of tax exempt secured debt.