Debt - Summary of Debt - Senior Secured Credit Facility - Outstanding borrowings (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Debt Disclosure [Abstract]
2020	$ 28,600
2021	28,600
2022	28,600
2023	28,600
2024	28,600
Thereafter	3,404,400
Total debt outstanding	3,547,400	$ 1,665,000
Less: capitalized debt issuance costs and original issue discount	(60,900)
Long-term Debt, Total	3,486,500
Proceeds from revolving credit facility	$ 60,000	$ 70,000	$ 45,000

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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