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Debt Obligations - Current Maturities of Long-Term Debt and Short-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
Short-term debt $ 4,233 $ 6,542
Current maturities of long-term debt 10,531 68,327
Current maturities of long-term debt and short-term debt $ 14,764 $ 74,869