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Financing Arrangements (Borrowings Under Existing Financing Arrangements) (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Debt Disclosure [Abstract]    
Total notes payable $ 37,021 $ 37,967
Less: current portion (3,828) (3,810)
Total long-term debt $ 33,193 $ 34,157