Long-Term Debt - Summary of Long-Term Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt, gross	$ 1,000,000	$ 1,000,000
Less: unamortized debt issuance costs and original issue discount	(8,392)	(8,787)
Long-term debt, net	$ 991,608	$ 991,213
2017 Term Loan Facility
Debt Instrument [Line Items]
Interest rate	2.36%	2.40%
Senior Unsecured Notes Due 2028 \| Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross	$ 600,000	$ 600,000
Interest rate	3.75%
2017 Term Loan Facility \| Term Loan
Debt Instrument [Line Items]
Long-term debt, gross	$ 400,000	$ 400,000

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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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
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-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

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-URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910

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