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Income Taxes - Additional Information (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 8 Months Ended 9 Months Ended 11 Months Ended 12 Months Ended
Dec. 31, 2020
Jul. 23, 2020
Jan. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2020
Sep. 30, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2017
Dec. 31, 2018
Income Tax Disclosure [Line Items]                      
Income tax rate     2.33% 17.30% 45.60% 21.40% 75.30% 19.29% 16.71%    
U.S. Federal statutory income tax rate     21.00% 21.00% 21.00% 21.00% 21.00% 21.00% 21.00% 35.00%  
Tax cuts and jobs act interest expense deduction     $ 38,400         $ 0 $ 35,600    
Tax cuts and jobs act income tax expense benefit     600         (1,600) 6,700    
Tax adjustments   $ 1,600                  
Accumulated unremitted Foreign earnings $ 36,800             36,800      
Research and development tax credit carryforward, amount $ 3,200             3,200 2,700    
Research and development tax credit carryforward expiration year 2034                    
Valuation allowance $ (4,560)             (4,560) (61,349)    
Unrecognized Tax Benefits $ 1,341   $ 1,290         $ 1,341 $ 1,296   $ 1,384
Income Tax Examination, Description The Company is no longer subject to U.S. federal examinations by tax authorities for years before 2012, and state, local, and non-U.S. income tax examinations by tax authorities before 2004.             a tax position must be more likely than not to be sustained upon examination by taxing authorities. The amount recognized is measured as the largest benefit that has a greater than 50% likelihood of being realized upon settlement.