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Long-Term Debt and Short-Term Borrowings - Future Aggregate Maturities of Gross Debt Narrative (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Debt Disclosure [Abstract]  
Future annual aggregate maturities, 2021 $ 1,390,808
Future annual aggregate maturities, 2022 0
Future annual aggregate maturities, 2023 488,759
Future annual aggregate maturities, 2024 300,000
Future annual aggregate maturities, 2025 0
Future annual aggregate maturities, thereafter $ 600,000