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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($)
Total
Common Stock
Additional Paid In Capital
Retained Earnings
Treasury Stock
Accumulated Other Comprehensive Income
BEGINNING BALANCE (in shares) at Dec. 31, 2022   33,429,557        
BEGINNING BALANCE at Dec. 31, 2022 $ 493,500,000 $ 300,000 $ 228,800,000 $ 513,100,000   $ 40,600,000
BEGINING BALANCE, Treasury Stock (in shares) at Dec. 31, 2022         (5,123,075)  
BEGINING BALANCE, Treasury Stock at Dec. 31, 2022         $ (289,300,000)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 110,900,000     110,900,000    
Issuance of common stock awards to employees (in shares)   146,308        
Surrender of common stock awards (in shares)         (48,760)  
Surrender of common stock awards (5,800,000)       $ (5,800,000)  
Share-based compensation expense 7,000,000.0   7,000,000.0      
Share-based compensation issued to directors (in shares)   6,538        
Share-based compensation issued to directors 300,000   300,000      
Dividends declared (44,300,000)     (44,300,000)    
Other comprehensive income (loss), net of tax (900,000)         (900,000)
ENDING BALANCE (in shares) at Jun. 30, 2023   33,582,403        
ENDING BALANCE at Jun. 30, 2023 560,700,000 $ 300,000 236,100,000 579,700,000   39,700,000
ENDING BALANCE, Treasury Stock (in shares) at Jun. 30, 2023         (5,171,835)  
ENDING BALANCE, Treasury Stock at Jun. 30, 2023         $ (295,100,000)  
BEGINNING BALANCE (in shares) at Mar. 31, 2023   33,498,693        
BEGINNING BALANCE at Mar. 31, 2023 505,300,000 $ 300,000 232,500,000 527,500,000   34,300,000
BEGINING BALANCE, Treasury Stock (in shares) at Mar. 31, 2023         (5,123,656)  
BEGINING BALANCE, Treasury Stock at Mar. 31, 2023         $ (289,300,000)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 61,600,000     61,600,000    
Issuance of common stock awards to employees (in shares)   77,172        
Surrender of common stock awards (in shares)         (48,179)  
Surrender of common stock awards (5,800,000)       $ (5,800,000)  
Share-based compensation expense 3,500,000   3,500,000      
Share-based compensation issued to directors (in shares)   6,538        
Share-based compensation issued to directors 100,000   100,000      
Dividends declared (9,400,000)     (9,400,000)    
Other comprehensive income (loss), net of tax 5,400,000         5,400,000
ENDING BALANCE (in shares) at Jun. 30, 2023   33,582,403        
ENDING BALANCE at Jun. 30, 2023 $ 560,700,000 $ 300,000 236,100,000 579,700,000   39,700,000
ENDING BALANCE, Treasury Stock (in shares) at Jun. 30, 2023         (5,171,835)  
ENDING BALANCE, Treasury Stock at Jun. 30, 2023         $ (295,100,000)  
BEGINNING BALANCE (in shares) at Dec. 31, 2023 33,587,701 33,587,701        
BEGINNING BALANCE at Dec. 31, 2023 $ 670,300,000 $ 300,000 244,700,000 693,800,000   33,700,000
BEGINING BALANCE, Treasury Stock (in shares) at Dec. 31, 2023 (5,220,363)       (5,220,363)  
BEGINING BALANCE, Treasury Stock at Dec. 31, 2023 $ (302,200,000)       $ (302,200,000)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 121,100,000     121,100,000    
Issuance of common stock awards to employees (in shares)   114,493        
Surrender of common stock awards (in shares)         (36,691)  
Surrender of common stock awards (8,000,000.0)       $ (8,000,000.0)  
Share-based compensation expense 7,800,000   7,800,000      
Share-based compensation issued to directors (in shares)   4,186        
Share-based compensation issued to directors 400,000   400,000      
Dividends declared $ (65,300,000)     (65,300,000)    
Common stock repurchase (in shares) (215,000)       (214,864)  
Common stock repurchase $ (45,700,000)       $ (45,700,000)  
Other comprehensive income (loss), net of tax $ 4,700,000         4,700,000
ENDING BALANCE (in shares) at Jun. 30, 2024 33,706,380 33,706,380        
ENDING BALANCE at Jun. 30, 2024 $ 685,300,000 $ 300,000 252,900,000 749,600,000   38,400,000
ENDING BALANCE, Treasury Stock (in shares) at Jun. 30, 2024 (5,471,918)       (5,471,918)  
ENDING BALANCE, Treasury Stock at Jun. 30, 2024 $ (355,900,000)       $ (355,900,000)  
BEGINNING BALANCE (in shares) at Mar. 31, 2024   33,658,330        
BEGINNING BALANCE at Mar. 31, 2024 679,200,000 $ 300,000 248,700,000 694,200,000   38,400,000
BEGINING BALANCE, Treasury Stock (in shares) at Mar. 31, 2024         (5,221,772)  
BEGINING BALANCE, Treasury Stock at Mar. 31, 2024         $ (302,400,000)  
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 65,200,000     65,200,000    
Issuance of common stock awards to employees (in shares)   43,864        
Surrender of common stock awards (in shares)         (35,282)  
Surrender of common stock awards (7,800,000)       $ (7,800,000)  
Share-based compensation expense 4,000,000.0   4,000,000.0      
Share-based compensation issued to directors (in shares)   4,186        
Share-based compensation issued to directors 200,000   200,000      
Dividends declared $ (9,800,000)     (9,800,000)    
Common stock repurchase (in shares) (215,000)       (214,864)  
Common stock repurchase $ (45,700,000)       $ (45,700,000)  
Other comprehensive income (loss), net of tax $ 0          
ENDING BALANCE (in shares) at Jun. 30, 2024 33,706,380 33,706,380        
ENDING BALANCE at Jun. 30, 2024 $ 685,300,000 $ 300,000 $ 252,900,000 $ 749,600,000   $ 38,400,000
ENDING BALANCE, Treasury Stock (in shares) at Jun. 30, 2024 (5,471,918)       (5,471,918)  
ENDING BALANCE, Treasury Stock at Jun. 30, 2024 $ (355,900,000)       $ (355,900,000)