Fair Value of Financial Instruments Fair Value of Long-Term Debt (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Fair Value Disclosures [Abstract]
Total long-term debt, excluding debt issuance costs	$ 3,069,417	$ 1,712,003
Total long-term debt, fair value, excluding debt issuance costs	$ 3,173,341	$ 1,731,271