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Derivative Instruments, Hedging Activities and Fair Value (Details 6) (USD $)	Sep. 30, 2014	Dec. 31, 2013
Long-term debt, including current maturities
Fair value of long-term debt	$ 842,500,000	$ 832,600,000
Carrying value of long-term debt	100,000	100,000
Long-term Debt	$ 806,000,000	$ 803,400,000

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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