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Fair Value Measurements Fair Value Measurements (Narrative) (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Fair Value Disclosures [Abstract]
Long-term Debt	$ 250,000,000	$ 0
Long-term Debt, Fair Value	$ 275,500,000	$ 0

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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