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Junior Subordinated Debentures (Narrative) (Details) (USD $)				12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013 Five Point Six Two Five Percent Subordinated Debentures [Member] Junior Subordinated Debentures	Dec. 31, 2013 Six Point Seven Five Zero Percent Subordinated Debentures [Member] Junior Subordinated Debentures
Debt Instrument [Line Items]
Junior subordinated debentures, aggregate principal amount			$ 350,000,000	$ 250,000,000
Junior subordinated debentures, interest rate, stated percentage			5.625%	6.75%
Junior subordinated debentures	339,800,000	243,206,000	339,800,000
Gains (Losses) on Extinguishment of Debt				$ 7,000,000

Including the current and noncurrent portions, carrying value as of the balance sheet date of long-term debt (with maturities initially due after one year or beyond the operating cycle if longer) identified as Junior Subordinated Notes, which have a lower priority than senior instruments.

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