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Debt (Schedule Of Annual Principal Payments On Long-Term Debt) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014
Debt [Abstract]
Thereafter	$ 350,000
Annual Principal Payments on Long-Term Debt, Total	$ 350,000us-gaap_LongTermDebt

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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