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Long Term Debt (Current & Noncurrent Breakout) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Debt Disclosure Current [Abstract]
Long-term debt	$ 603,409	$ 620,705
Less current portion	19,942	17,407
Long-term debt, gross	$ 623,351	$ 638,112

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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