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Debt Obligations - Current Maturities of Long-Term Debt and Short-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Debt Disclosure [Abstract]    
Short-term debt $ 33,422 $ 0
Current maturities of long-term debt 32,224 1,220
Current maturities of long-term debt and short-term debt $ 65,646 $ 1,220