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Fair Value Measurements (Fair Value Inputs, Liabilities, Quantitative Information) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Fair Value Inputs, Liabilities, Quantitative Information    
Long-term Debt $ 579,782 $ 640,355
Unamortized deferred loan costs 14,218 $ 15,645
Level 1 Inputs    
Fair Value Inputs, Liabilities, Quantitative Information    
Long-term debt, fair value $ 599,900