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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Deficit [Member]
Accumulated Other Comprehensive Income [Member]
Balance, beginning of period at Dec. 31, 2022 $ 2,263,153 $ 79,683 $ 2,294,797 $ (208,979) $ 97,652
Balance, beginning of period (shares) at Dec. 31, 2022   79,683,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 16,260     16,260  
Shares issued for stock compensation   $ 233 (233)    
Shares issued for stock compensation (shares)   233,000      
Equity-based compensation expense 2,279   2,279    
Pension plans and OPEB obligations, net of tax (131)       (131)
Cash flow hedges, net of tax (17,335)       (17,335)
Dividends on common stock (35,962)     (35,962)  
Other transactions, net (1)   84 (85)  
Balance, end of period at Mar. 31, 2023 2,228,263 $ 79,916 2,296,927 (228,766) 80,186
Balance, end of period (shares) at Mar. 31, 2023   79,916,000      
Balance, beginning of period at Dec. 31, 2022 2,263,153 $ 79,683 2,294,797 (208,979) 97,652
Balance, beginning of period (shares) at Dec. 31, 2022   79,683,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 62,241        
Cash flow hedges, net of tax 28,848        
Balance, end of period at Sep. 30, 2023 2,239,097 $ 79,628 2,301,301 (267,725) 125,893
Balance, end of period (shares) at Sep. 30, 2023   79,628,000      
Balance, beginning of period at Mar. 31, 2023 2,228,263 $ 79,916 2,296,927 (228,766) 80,186
Balance, beginning of period (shares) at Mar. 31, 2023   79,916,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 22,306     22,306  
Shares issued for stock compensation   $ 4 (4)    
Shares issued for stock compensation (shares)   4,000      
Equity-based compensation expense 1,577   1,577    
Repurchase of common stock (394) $ (9) (385)  
Repurchase of common stock (shares)   (9,000)      
Pension plans and OPEB obligations, net of tax (344)       (344)
Cash flow hedges, net of tax 17,719       17,719
Dividends on common stock (35,958)     (35,958)  
Other transactions, net     93 (93)  
Balance, end of period at Jun. 30, 2023 2,233,169 $ 79,911 2,298,593 (242,896) 97,561
Balance, end of period (shares) at Jun. 30, 2023   79,911,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 23,675     23,675  
Equity-based compensation expense 2,616   2,616    
Repurchase of common stock (12,735) $ (283)   (12,452)  
Repurchase of common stock (shares)   (283,000)      
Pension plans and OPEB obligations, net of tax (132)       (132)
Cash flow hedges, net of tax 28,464       28,464
Dividends on common stock (35,960)     (35,960)  
Other transactions, net     92 (92)  
Balance, end of period at Sep. 30, 2023 2,239,097 $ 79,628 2,301,301 (267,725) 125,893
Balance, end of period (shares) at Sep. 30, 2023   79,628,000      
Balance, beginning of period at Dec. 31, 2023 $ 2,171,098 $ 79,365 2,303,992 (315,291) 103,032
Balance, beginning of period (shares) at Dec. 31, 2023 79,365,000 79,365,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income $ (305)     (305)  
Shares issued for stock compensation   $ 143 (143)    
Shares issued for stock compensation (shares)   143,000      
Equity-based compensation expense 2,560   2,560    
Pension plans and OPEB obligations, net of tax (229)       (229)
Cash flow hedges, net of tax 15,925       15,925
Dividends on common stock (35,779)     (35,779)  
Other transactions, net 2   90 (88)  
Balance, end of period at Mar. 31, 2024 2,153,272 $ 79,508 2,306,499 (351,463) 118,728
Balance, end of period (shares) at Mar. 31, 2024   79,508,000      
Balance, beginning of period at Dec. 31, 2023 $ 2,171,098 $ 79,365 2,303,992 (315,291) 103,032
Balance, beginning of period (shares) at Dec. 31, 2023 79,365,000 79,365,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income $ 16,682        
Cash flow hedges, net of tax (9,177)        
Balance, end of period at Sep. 30, 2024 $ 2,052,025 $ 78,862 2,312,586 (432,589) 93,166
Balance, end of period (shares) at Sep. 30, 2024 78,862,000 78,862,000      
Balance, beginning of period at Mar. 31, 2024 $ 2,153,272 $ 79,508 2,306,499 (351,463) 118,728
Balance, beginning of period (shares) at Mar. 31, 2024   79,508,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 13,678     13,678  
Shares issued for stock compensation   $ 4 (4)    
Shares issued for stock compensation (shares)   4,000      
Equity-based compensation expense 2,962   2,962    
Repurchase of common stock (25,012) $ (610)   (24,402)  
Repurchase of common stock (shares)   (610,000)      
Pension plans and OPEB obligations, net of tax (230)       (230)
Cash flow hedges, net of tax 3,611       3,611
Dividends on common stock (35,677)     (35,677)  
Other transactions, net (5)   98 (103)  
Balance, end of period at Jun. 30, 2024 2,112,599 $ 78,902 2,309,555 (397,967) 122,109
Balance, end of period (shares) at Jun. 30, 2024   78,902,000      
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net income 3,309     3,309  
Shares issued for stock compensation   $ 16 (16)    
Shares issued for stock compensation (shares)   16,000      
Equity-based compensation expense 2,946   2,946    
Repurchase of common stock (2,400) $ (56)   (2,344)  
Repurchase of common stock (shares)   (56,000)      
Pension plans and OPEB obligations, net of tax (230)       (230)
Cash flow hedges, net of tax (28,713)       (28,713)
Dividends on common stock (35,486)     (35,486)  
Other transactions, net     101 (101)  
Balance, end of period at Sep. 30, 2024 $ 2,052,025 $ 78,862 $ 2,312,586 $ (432,589) $ 93,166
Balance, end of period (shares) at Sep. 30, 2024 78,862,000 78,862,000