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Fair Value Measurements (Fair Value Inputs, Liabilities, Quantitative Information) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Fair Value Inputs, Liabilities, Quantitative Information    
Long-term Debt $ 723,219 $ 755,508
Unamortized Debt Issuance Expense (17,781) (18,500)
Level 2 Inputs    
Fair Value Inputs, Liabilities, Quantitative Information    
Long-term debt, fair value 744,500  
Fair Value, Measurements, Recurring [Member] | Significant Unobservable Inputs (Level 3)    
Fair Value Inputs, Liabilities, Quantitative Information    
Obligations, Fair Value Disclosure $ (21,600) $ (21,000)