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Long-term Debt - Fair Value of Company's Long-term Debt Obligation (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Instrument [Line Items]
Total debt	$ 564,724	$ 811,650	$ 551,941
Less: Current portion of long-term debt	0	(6,700)	0
Total long-term debt	564,724	804,950	551,941
Less: Deferred financing costs	(10,319)	(26,345)	(11,102)
Long-term debt, net	554,405	778,605	540,839
Successor First Lien Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	564,724	666,650
Successor Second Lien Credit Facility [Member]
Debt Instrument [Line Items]
Total debt	$ 0	$ 145,000
Predecessor First Lien Facility [Member]
Debt Instrument [Line Items]
Total debt			401,941
Predecessor Second Lien Facility [Member]
Debt Instrument [Line Items]
Total debt			$ 150,000

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- Definition

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, after accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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

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