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Debt - Additional Information (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Jul. 16, 2021 | Sep. 26, 2021 | Sep. 26, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Line of Credit Facility [Line Items] |  |  |  |  |
Long-term Debt, Gross |  | $ 575,922 | $ 575,922 | $ 674,986 | $ 526,635
Loss on early extinguishment of debt |  | (1,425) | $ (1,425) |  |
Revolving Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Maturity |  |  | 2023-10 | 2023-10 |
Term Loan [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Maturity |  |  | 2025-10 | 2025-10 |
First Lien Note [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument Face Amount |  | 600,000 | $ 600,000 | $ 600,000 |
Long-term Debt, Gross |  | 539,202 | 539,202 | 541,969 | 376,200
Principal payment |  |  | 1,382 | 1,382 |
Total outstanding letters of credit |  |  |  | 1,200 | 1,200
First Lien Note [Member] | Term Loan [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument Face Amount |  | 550,000 | 550,000 | 550,000 |
Second Lien Note [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument Face Amount |  | 145,000 | 145,000 | 145,000 |
Long-term Debt, Gross |  | 45,000 | 45,000 | 145,000 | 145,000
Repayment of outstanding principal | $ 100,000 |  |  |  |
Loss on early extinguishment of debt | $ 1,425 |  |  |  |
Second Lien Note [Member] | Sentinel Capital Partners Junior Fund I [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Amount outstanding, related party |  | $ 6,207 | $ 6,207 | $ 20,000 | $ 20,000
LIBOR [Member] | First Lien Note [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 5.10% | 5.10% | 5.20% | 6.90%
LIBOR [Member] | First Lien Note [Member] | Revolving Credit Facility [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Maximum borrowings |  | $ 50,000 | $ 50,000 | $ 50,000 |
LIBOR [Member] | Second Lien Note [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  | 8.50% | 8.50% | 8.70% | 10.40%
Prime Rate [Member] |  |  |  |  |
Line of Credit Facility [Line Items] |  |  |  |  |
Debt Instrument, Interest Rate, Effective Percentage |  |  |  |  | 8.00%
Long-term Debt, Gross |  |  |  | $ 0 |

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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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=123466204&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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