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Fair Value Measurements (Details) (Fair Value, Inputs, Level 1 [Member], 6.75% Notes [Member], USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Fair Value, Inputs, Level 1 [Member] \| 6.75% Notes [Member]
Liabilities:
Long term debt, Carrying Amount	$ 663,918	$ 664,056
Long term debt, Fair Value	$ 694,650	$ 690,525

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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