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Corporate Debt (Schedule Of Corporate Debt Principal Maturities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Debt Instrument [Line Items]
Long-term Debt, Total	$ 325,000	$ 383,992
Senior Notes [Member]
Debt Instrument [Line Items]
Thereafter	325
Long-term Debt, Total	$ 325

Carrying amount of long-term debt, net of unamortized discount or premium, including current and noncurrent amounts. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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