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Long Term Debt (Current & Noncurrent Breakout) (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011
Debt Disclosure Current [Abstract]
Long-term debt	$ 620,705,000	$ 447,963,000
Less current portion	17,407,000	10,800,000
Long-term debt, gross	$ 638,112	$ 458,763

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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