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Fair Value Measurements (Details) - 6.75% Notes - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Liabilities:    
Debt instrument, stated interest rate 6.75%  
Fair Value, Inputs, Level 1    
Liabilities:    
Long term debt, Carrying Amount $ 741,133 $ 742,017
Long term debt, Fair Value $ 733,163 $ 751,538