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Debt - Maturities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
Current portion of long-term debt $ 10,795 $ 799
Total 485,178 $ 478,895
2019 8,180  
2020 14,243  
2021 10,236  
2022 452,519  
2023 0  
Thereafter $ 0