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Fair Value of Financial Instruments Fair Value of Long-Term Debt (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Fair Value Disclosures [Abstract]    
Total long-term debt, excluding debt issuance costs $ 3,588,157 $ 3,069,417
Total long-term debt, fair value, excluding debt issuance costs $ 3,783,225 $ 3,173,341