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Long-Term Debt - Maturity Table (Details) - Secured Debt [Member] - 2013 Term Loan Facility Maturing November 15, 2020 [Member] - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Nov. 15, 2013
Long-term Debt, Fiscal Year Maturity [Abstract]      
2017 $ 2,082,000    
2018 2,082,000    
2019 2,082,000    
2020 195,754,000    
2021 0    
2022 and thereafter 0    
2013 Term Loan Facility $ 202,000,000 $ 275,417,000 $ 325,000,000