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Debt (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Fair value of senior secured term loan based on quoted market prices
Carrying amount, net	$ 209,565	$ 209,548
Senior secured term loan [Member]
Fair value of senior secured term loan based on quoted market prices
Carrying amount, net	210,000	210,000
Fair value	$ 229,950	$ 226,800

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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