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Debt Obligations - Current Maturities of Long-Term Debt and Short-Term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
Short-term debt $ 18,814 $ 33,422
Current maturities of long-term debt 34,047 32,224
Current maturities of long-term debt and short-term debt $ 52,861 $ 65,646