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Fair Value Measurement (Details 3) - USD ($)
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Fair Value Measurement      
Long-term debt $ 246,992,000   $ 253,400,000
Nonrecurring      
Fair Value Measurement      
Impairment charges 0 $ 0  
Carrying Amount      
Fair Value Measurement      
Cash and cash equivalents 18,992,000   18,196,000
Fair Value      
Fair Value Measurement      
Cash and cash equivalents 18,992,000   18,196,000
Senior credit facility, net of discount      
Fair Value Measurement      
Long-term debt 244,905,000   251,010,000
Senior credit facility, net of discount | Carrying Amount      
Fair Value Measurement      
Long-term debt 246,992,000   253,400,000
Senior credit facility, net of discount | Fair Value      
Fair Value Measurement      
Long-term debt $ 246,992,000   $ 253,400,000