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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2024
Accounting Policies [Abstract]  
Inventories
Inventories

Inventories are stated at average cost. Inventory consisted of the following (in thousands):
 December 31,
 20242023
Materials and supplies$103,671 $85,876 
Storage gas and fuel19,269 28,663 
Total Inventories$122,940 $114,539 
Schedule of Accrued Liabilities
Accrued Expenses and other

Accrued expenses and other consisted of the following (in thousands):
December 31,
20242023
Property taxes$81,716 $79,252 
Employee compensation, benefits, and withholdings49,786 41,773 
Interest28,702 24,775 
Customer advances16,535 27,656 
Other (none of which is individually significant)77,860 72,711 
Total Accrued Expenses$254,599 $246,167 
Other Noncurrent Liabilities
Other Noncurrent Liabilities
Other noncurrent liabilities consisted of the following (in thousands):
 December 31,
 20242023
Customer advances$123,249 $107,470 
Pension and other employee benefits 56,603 75,302 
AROs37,725 39,255 
Future QF obligation, net23,498 28,670 
Environmental20,350 21,135 
Other (none of which is individually significant)54,619 60,540 
 Total Noncurrent Liabilities$316,044 $332,372 
Supplemental Cash Flow Information
Supplemental Cash Flow Information
 Year Ended December 31,
 202420232022
(in thousands)
Cash (received) paid for:   
Income taxes$(4,284)$(827)$4,707 
Production tax credits(1)
(6,867)— — 
Interest128,333 105,238 95,400 
Significant non-cash transactions:  
Capital expenditures included in trade accounts payable22,377 42,322 64,758 
Reconciliation of Cash and Restricted Cash [Table Text Block]
The following table provides a reconciliation of cash, cash equivalents, and restricted cash reported within the Consolidated Balance Sheets that sum to the total of the same such amounts shown in the Consolidated Statements of Cash Flows (in thousands):
December 31,
202420232022
Cash and cash equivalents$4,283 $9,164 $8,489 
Restricted cash24,734 16,023 13,974 
Total cash, cash equivalents, and restricted cash shown in the Consolidated Statements of Cash Flows$29,017 $25,187 $22,463