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Fair Value of Financial Instruments: (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Fair Value of Financial Instruments:
Carrying amount of long-term debt	$ 328.6	$ 197.5
Fair value of long-term debt	$ 350.5	$ 209.1

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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