XML 127 R100.htm IDEA: XBRL DOCUMENT v3.25.0.1
Employee Benefit Plans - Change in Benefit Obligations and Plan Assets (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Pension Benefits      
Change in benefit obligation:      
Benefit obligation at beginning of year $ 275,586 $ 278,286  
Service cost 0 0 $ 0
Interest cost 12,799 13,521 9,396
Plan participants' contributions 0 0  
Actuarial (gain) loss (11,040) 5,395  
Benefits paid (21,995) (21,616)  
Benefit obligation at end of year 255,350 275,586 278,286
Change in net plan assets:      
Fair value of plan assets at beginning of year 248,558 242,031  
Actual return on plan assets 1,152 20,576  
Employer contribution 2,911 7,567  
Plan participants' contributions 0 0  
Benefits paid (21,995) (21,616)  
Fair value of net plan assets at end of year 230,626 248,558 242,031
Funded status - (under) over (24,724) (27,028)  
Amounts recognized in the Consolidated Balance Sheets at December 31:      
Noncurrent assets - other 0 0  
Noncurrent liabilities - other 24,724 27,028  
Benefit obligation (liabilities) assets - net amount recognized (24,724) (27,028)  
Amounts recognized in accumulated other comprehensive loss:      
Actuarial loss (gain) 13,228 32,273  
Prior service credit 0 0  
Total 13,228 32,273  
Amounts recognized in regulatory assets or liabilities:      
Actuarial loss (gain) 139,962 140,232  
Prior service credit 0 0  
Total 139,962 140,232  
Other Postretirement Benefits      
Change in benefit obligation:      
Benefit obligation at beginning of year 39,590 40,315  
Service cost 505 534 894
Interest cost 1,837 1,956 1,383
Plan participants' contributions 412 479  
Actuarial (gain) loss (3,420) (215)  
Benefits paid (3,249) (3,479)  
Benefit obligation at end of year 35,675 39,590 40,315
Change in net plan assets:      
Fair value of plan assets at beginning of year 79,234 76,640  
Actual return on plan assets 2,297 5,518  
Employer contribution 71 76  
Plan participants' contributions 412 479  
Benefits paid (3,249) (3,479)  
Fair value of net plan assets at end of year 78,765 79,234 $ 76,640
Funded status - (under) over 43,090 39,644  
Amounts recognized in the Consolidated Balance Sheets at December 31:      
Noncurrent assets - other 43,090 39,644  
Noncurrent liabilities - other 0 0  
Benefit obligation (liabilities) assets - net amount recognized 43,090 39,644  
Amounts recognized in accumulated other comprehensive loss:      
Actuarial loss (gain) (809) (3,515)  
Prior service credit (37) (115)  
Total (846) (3,630)  
Amounts recognized in regulatory assets or liabilities:      
Actuarial loss (gain) (1,478) (1,146)  
Prior service credit (1,303) (2,619)  
Total $ (2,781) $ (3,765)