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Long-Term Debt and Revolving Line of Credit - Maturities of Long-term Debt (Details) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Maturities of Long-term Debt [Abstract]    
Remainder of 2016 $ 6,062  
2017 36,375  
2018 68,500  
2019 88,500  
2020 100,625  
Thereafter 528,875  
Total $ 828,937 $ 201,250