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Junior Subordinated Debentures (Narrative) (Details) (USD $)	Dec. 31, 2011	Dec. 31, 2010
Debt Instrument [Line Items]
Junior subordinated debentures, aggregate principal amount	$ 1,510,829,000
Junior subordinated debentures	242,997,000	242,784,000
Trust Preferred Securities Subject To Mandatory Redemption [Member]
Debt Instrument [Line Items]
Junior subordinated debentures, interest rate, stated percentage	6.75%
Junior Subordinated Debentures [Member]
Debt Instrument [Line Items]
Junior subordinated debentures, aggregate principal amount	250,000,000
Junior subordinated debentures, interest rate, stated percentage	6.75%
Junior subordinated debentures	$ 243,000,000

Including the current and noncurrent portions, carrying value as of the balance sheet date of subordinated debt (with initial maturities beyond one year or beyond the operating cycle if longer). Subordinated debt places a lender in a lien position behind debt having a higher priority of repayment in liquidation of the entity's assets.

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