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Long-Term Debt (Narrative) (Details) - USD ($)
 3 Months Ended 9 Months Ended
Nov. 09, 2023
Mar. 04, 2022
Oct. 07, 2021
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Debt Instrument [Line Items]                
Interest expense       $ 700,000 $ 700,000 $ 2,100,000 $ 1,800,000  
Debt repurchase program, principal reduction amount $ 300,000,000              
Principal retired       31,100,000   124,200,000 0  
Current portion of long-term debt       9,366,000   9,366,000   $ 8,575,000
Gain on extinguishment of debt       100,000   6,667,000 $ 0  
Senior Notes                
Debt Instrument [Line Items]                
Retired debt, principal       186,800,000   186,800,000    
Senior Notes | 2026 Notes                
Debt Instrument [Line Items]                
Notes payable, fair value       254,900,000   254,900,000   266,000,000
Debt instrument, face amount     $ 305,000,000          
Proceeds from issuance of senior long-term debt     $ 301,200,000          
Stated interest rate     6.00%          
Covenant, leverage ratio, minimum     3.0          
Covenant, leverage ratio, maximum     3.0          
Covenant, restriction on payments, aggregate amount, maximum     $ 100,000,000          
Covenant, earnings before interest, taxes, depreciation, and amortization, maximum     50.00%          
Senior Notes | 2028 Notes                
Debt Instrument [Line Items]                
Notes payable, fair value       361,800,000   361,800,000   $ 422,500,000
Debt instrument, face amount     $ 500,000,000          
Proceeds from issuance of senior long-term debt     $ 483,800,000          
Stated interest rate     6.50%          
Covenant, leverage ratio, minimum     3.0          
Covenant, leverage ratio, maximum     3.0          
Covenant, restriction on payments, aggregate amount, maximum     $ 100,000,000          
Covenant, earnings before interest, taxes, depreciation, and amortization, maximum     50.00%          
Line of Credit | Revolving Credit Facility                
Debt Instrument [Line Items]                
Line of credit facility, maximum borrowing capacity   $ 25,000,000            
Line of credit facility, accordion feature, increase limit   $ 25,000,000            
Long-term line of credit       $ 0   $ 0    
Line of Credit | Revolving Credit Facility | Minimum                
Debt Instrument [Line Items]                
Debt instrument, basis spread on variable rate   1.75%            
Line of Credit | Revolving Credit Facility | Maximum                
Debt Instrument [Line Items]                
Debt instrument, basis spread on variable rate   2.50%