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Long-Term Debt - Anticipated Annual Future Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Debt obligation, net $ 142,434 $ 152,806
Line of credit    
Debt Instrument [Line Items]    
2018 6,166  
2019 6,831  
2020 8,775  
2021 9,506  
2022 112,808  
Thereafter 0  
Debt obligation, net $ 144,086