Quarterly report pursuant to Section 13 or 15(d)

Debt - Narrative (Details)

v3.21.2
Debt - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Jul. 12, 2018
Debt Instrument [Line Items]            
Amortization of debt issuance costs     $ 3,139,000 $ 3,012,000    
Weighted average interest rate 4.57%   4.57%   5.06%  
Line of Credit | LIBOR            
Debt Instrument [Line Items]            
Basis spread on variable rate     1.00%      
Line of Credit | First Lien Term Loan Facility            
Debt Instrument [Line Items]            
Principal amount           $ 835,000,000
Debt instrument, floor     0.00%      
Periodic payment percentage of principal     0.25%      
Periodic payment, amount     $ 2,100,000      
Amortization of debt issuance costs and discounts $ 200,000 $ 200,000 $ 600,000 600,000    
Line of Credit | First Lien Term Loan Facility | LIBOR            
Debt Instrument [Line Items]            
Basis spread on variable rate     3.75%      
Line of Credit | First Lien Term Loan Facility | Federal Funds            
Debt Instrument [Line Items]            
Basis spread on variable rate     0.50%      
Line of Credit | First Lien Term Loan Facility | ABR            
Debt Instrument [Line Items]            
Basis spread on variable rate     2.75%      
Line of Credit | Revolving Credit Facility            
Debt Instrument [Line Items]            
Maximum borrowing capacity           100,000,000.0
Available borrowing $ 88,200,000   $ 88,200,000      
Debt instrument leverage ratio percent 35.00%   35.00%   35.00%  
Amortization of debt issuance costs $ 100,000 100,000 $ 300,000 300,000    
Unused capacity, commitment fee percentage     0.50%   0.50%  
Line of Credit | Revolving Credit Facility | LIBOR            
Debt Instrument [Line Items]            
Basis spread on variable rate     3.00%      
Margin for borrowing 3.00%   3.00%      
Line of Credit | Revolving Credit Facility | ABR            
Debt Instrument [Line Items]            
Margin for borrowing 2.00%   2.00%      
Line of Credit | Second Lien Term Loan Facility            
Debt Instrument [Line Items]            
Principal amount           215,000,000.0
Debt instrument, floor     0.00%      
Amortization of debt issuance costs and discounts $ 700,000 $ 700,000 $ 2,200,000 $ 2,100,000    
Line of Credit | Second Lien Term Loan Facility | LIBOR            
Debt Instrument [Line Items]            
Basis spread on variable rate     7.25%   7.25%  
Margin for borrowing 7.25%   7.25%      
Line of Credit | Second Lien Term Loan Facility | ABR            
Debt Instrument [Line Items]            
Margin for borrowing 6.25%   6.25%      
Line of Credit | Letter of Credit            
Debt Instrument [Line Items]            
Maximum borrowing capacity           $ 40,000,000.0
Letters of credit outstanding $ 1,800,000   $ 1,800,000