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Fair Value Measurements (Details) (Fair Value, Inputs, Level 1 [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Fair Value, Inputs, Level 1 [Member]
Liabilities:
Long term debt, Carrying Amount	$ 429,193	$ 344,439
Long term debt, Fair Value	$ 467,500	$ 367,400

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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