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Fair Value Measurements (Details) (Fair Value, Inputs, Level 1 [Member], USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Fair Value, Inputs, Level 1 [Member]
   
Liabilities:    
Long term debt, Carrying Amount $ 664,056 $ 429,193
Long term debt, Fair Value $ 690,525 $ 467,500