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Fair Value Disclosures (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Cash Equivalents $ 16,283 $ 17,198
Long-Term Debt (Excluding Debt Issuance Costs) 2,754,443 2,378,205
Carrying Amount    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Cash Equivalents 16,283 17,198
Long-Term Debt (Excluding Debt Issuance Costs) 2,763,433 2,387,001
Fair Value    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Cash and Cash Equivalents 16,283 17,198
Long-Term Debt (Excluding Debt Issuance Costs) $ 2,619,676 $ 2,290,537