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Fair Value Measurements (Details) (6.75% Notes, USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Liabilities:    
Debt instrument, stated interest rate 6.75%  
Fair Value, Inputs, Level 1
   
Liabilities:    
Long term debt, Carrying Amount $ 742,576 $ 664,056
Long term debt, Fair Value $ 775,425 $ 690,525