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Financing Arrangements (Future Principal Payments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Debt Disclosure [Abstract]    
2020 $ 2,811  
2021 3,810  
2022 18,126  
2023 16,032  
Long-term notes $ 40,779 $ 41,708