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Fair Value Measurements (Narrative) (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Fair Value Measurements
Business Acquisition, Preacquisition Contingency, Amount of Settlement	$ 2,744,000
Debt Instrument [Line Items]
Long-term Debt gross	623,351,000	638,112,000
Fixed Interest Rate [Member]
Debt Instrument [Line Items]
Long-term Debt gross	352,403,000
Long-term Debt, Fair Value	371,090,000
Variable Interest Rate [Member]
Debt Instrument [Line Items]
Long-term Debt gross	270,948,000
Long-term Debt, Fair Value	$ 270,948,000

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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