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Long-Term Debt (Maturities of Long-term Debt) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Mar. 31, 2019
Debt Disclosure [Abstract]    
2021 $ 0  
2022 0  
2023 0  
2024 1,290,000  
2025 55,000  
Thereafter 400,000  
Long-term debt, gross $ 1,745,000 $ 1,813,000