Fair Value of Financial Instruments - Fair Value of Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Fair Value Disclosures [Abstract]
Total long-term debt, excluding debt issuance costs	$ 3,158,293	$ 3,069,417
Total long-term debt, fair value, excluding debt issuance costs	$ 3,015,381	$ 3,173,341