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Repayments of Outstanding Principal under Term Loan Facility (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Long Term Debt Maturities Repayments Of Principal [Line Items]    
Total Senior Credit Facilities $ 207,378 $ 234,619
Term Loan    
Long Term Debt Maturities Repayments Of Principal [Line Items]    
2019 4,600  
2020 9,200  
2021 60,725  
Total Senior Credit Facilities $ 74,525