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Debt (Details 2) (Senior secured term loan [Member], USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Senior secured term loan [Member]
Fair value of senior secured term loan based on quoted market prices
Carrying amount, net	$ 210,000	$ 198,923
Fair value	$ 226,800	$ 198,247

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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