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Fair Value Measurements Fair Value Measurements (Narrative) (Details) (USD $)	Mar. 31, 2015	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Long-term Debt	$ 595,266,000us-gaap_LongTermDebt	$ 593,350,000us-gaap_LongTermDebt
Long-term Debt, Fair Value	$ 732,800,000us-gaap_LongTermDebtFairValue	$ 711,100,000us-gaap_LongTermDebtFairValue

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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