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Fair Value Measurements - Schedule of Fair Value of Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Money Market Funds $ 1,163 $ 21,199
Short-Term Debt (80,997) (6,000)
Long-Term Debt (764,519) (689,764)
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Money Market Funds 1,163 21,199
Short-Term Debt (80,997) (6,000)
Long-Term Debt $ (858,455) $ (742,279)