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Senior Notes (Corporate Debt Maturities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Long-term Debt, Total	$ 625,000us-gaap_LongTermDebt	$ 325,000us-gaap_LongTermDebt
Senior Notes [Member]
Debt Instrument [Line Items]
2015	175
Thereafter	450
Long-term Debt, Total	$ 625

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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