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Indebtedness (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Debt Instrument    
Long-term debt $ 292,858 $ 344,322
Less: Current portion 2,500 2,500
Total long-term debt 290,358 341,822
Term loan credit facility
   
Debt Instrument    
Long-term debt 242,858 244,322
Revolving credit facility
   
Debt Instrument    
Long-term debt $ 50,000 $ 100,000