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Debt - Maturities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
2019 $ 5,679  
2020 7,571  
2021 7,571  
2022 3,179  
Year Ended December 31, $ 24,000 $ 34,000