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Shareholders Equity Shareholders' Equity (Details) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Jun. 30, 2023
Mar. 31, 2023
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2023
Sep. 30, 2022
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Beginning balance     $ 1,297,900       $ 1,297,900  
Net income $ 17,000     $ 77,700     38,300 $ 150,700
Payments for Repurchase of Common Stock 85,000           150,000  
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation 4,900 $ 300            
Net other comprehensive income (loss) 0     100     (500) 0
Ending balance 1,200,000           1,200,000  
Net changes in pension and other postretirement benefits $ (100) $ (100)   $ 0     $ (300) $ (100)
Treasury Stock, Shares, Acquired 1,200           2,300  
Common Stock                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Beginning balance (in shares) 75,200 75,200 75,200 75,000 75,000 75,000 75,200 75,000
Beginning balance $ 800 $ 800 $ 800 $ 800 $ 800 $ 800 $ 800 $ 800
Net changes in pension and other postretirement benefits 200              
Ending balance (in shares) 75,400 75,200 75,200 75,000 75,000 75,000 75,400 75,000
Ending balance $ 800 $ 800 $ 800 $ 800 $ 800 $ 800 $ 800 $ 800
Additional Paid-in Capital                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Beginning balance 1,110,300 1,103,600 1,097,900 1,089,700 1,086,400 1,083,000 1,097,900 1,083,000
Share-based compensation cost 6,800 7,000 5,700 4,600 3,500 3,400    
Shares Issued Under Share Based Compensation Plans, Amount       (2,300)        
Share-Based Payment Arrangement, Shares Withheld for Tax Withholding Obligation         (200)      
Ending balance 1,112,200 1,110,300 1,103,600 1,092,000 1,089,700 1,086,400 1,112,200 1,092,000
Warrants                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Beginning balance 16,400 16,400 16,400 16,400 16,400 16,400 16,400 16,400
Ending balance 16,400 16,400 16,400 16,400 16,400 16,400 16,400 16,400
Retained Earnings                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Beginning balance 177,400 206,800 160,100 56,600 (55,000) (16,400) 160,100 (16,400)
Net income 12,900 (29,400) 46,700 74,300 111,600 (38,600)    
Ending balance 190,300 177,400 206,800 130,900 56,600 (55,000) 190,300 130,900
AOCI                 
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Beginning balance 14,200 14,500 14,700 (9,200) (9,400) (9,100) 14,700 (9,100)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment, after Tax     (100)   (100)      
Net other comprehensive income (loss) 100 (200) (100) 100 300 (300)    
Ending balance 14,200 14,200 14,500 (9,100) (9,200) (9,400) 14,200 (9,100)
Treasury Stock, Common                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Beginning balance (65,000) 0 0       0  
Payments for Repurchase of Common Stock (85,000) (65,000)            
Ending balance (150,000) (65,000) 0       (150,000)  
Non-controlling Interest                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Beginning balance 12,000 9,900 8,000 2,700 1,500 2,700 8,000 2,700
Net income 4,100 2,100 1,900 3,400 1,200 (1,200)    
Ending balance $ 16,100 $ 12,000 $ 9,900 $ 6,100 $ 2,700 $ 1,500 $ 16,100 $ 6,100