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Long-term debt - Narrative (Details) - USD ($)
 3 Months Ended
Nov. 23, 2020
Mar. 31, 2024
Dec. 31, 2023
Sep. 30, 2023
Sep. 28, 2020
Sep. 22, 2020
Debt Instrument [Line Items]            
Debt issuance costs $ 3,100,000          
Debt issuance cost, amount paid to subsidiary 1,900,000          
Debt issuance costs capitalized $ 1,200,000          
5.50% Senior Secured Notes            
Debt Instrument [Line Items]            
Long-term debt, gross   $ 113,050,000 $ 113,050,000      
Interest expense   1,600,000        
6.75% Senior Secured Notes            
Debt Instrument [Line Items]            
Long-term debt, gross         $ 150,000,000  
Long term debt held in treasury         1,400,000  
Long term debt outstanding, net of amount held in treasury         148,600,000  
Senior Secured Notes | 5.50% Senior Secured Notes            
Debt Instrument [Line Items]            
Stated interest rate (as a percent)           5.50%
Aggregate principal amount of debt issued           $ 125,000,000
Issue price (as a percent)           100.00%
Redemption price (as a percent) 99.80%          
Interest rate during period (as a percent) 5.50%          
Debt instrument, repurchase amount       $ 1,000,000    
Notes outstanding   $ 113,050,000.00        
Senior Secured Notes | 6.75% Senior Secured Notes            
Debt Instrument [Line Items]            
Stated interest rate (as a percent)           6.75%
Long-term debt, gross         $ 150,000,000