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Business Segment Information (Tables)
6 Months Ended
Jun. 30, 2021
Segment Reporting Information, Additional Information [Abstract]  
Schedule of Segment Reporting Information, by Segment
Segment information was as follows (in thousands):
Total assets (net of intercompany eliminations) as of:June 30, 2021December 31, 2020
Electric Utilities$3,239,628 $3,120,928 
Gas Utilities4,935,784 4,376,204 
Power Generation394,213 404,220 
Mining75,109 77,085 
Corporate and Other93,318 110,349 
Total assets$8,738,052 $8,088,786 

Three Months Ended June 30, 2021External Operating RevenueInter-company Operating Revenue Total Revenues
 Contract Customers Other Revenues  Contract Customers  Other Revenues
Segment:
Electric Utilities$177,092 $2,279 $5,562 $— $184,933 
Gas Utilities183,187 1,250 1,519 94 186,050 
Power Generation1,432 386 23,480 50 25,348 
Mining6,712 234 7,142 341 14,429 
Inter-company eliminations— — (37,703)(485)(38,188)
Total$368,423 $4,149 $— $— $372,572 

Three Months Ended June 30, 2020External Operating RevenueInter-company Operating Revenue Total Revenues
 Contract Customers Other Revenues  Contract Customers  Other Revenues
Segment:
Electric Utilities$156,197 $1,627 $5,376 $— $163,200 
Gas Utilities159,824 512 774 — 161,110 
Power Generation1,242 349 24,476 55 26,122 
Mining6,930 233 7,916 337 15,416 
Inter-company eliminations— — (38,542)(392)(38,934)
Total$324,193 $2,721 $— $— $326,914 
Six Months Ended June 30, 2021External Operating RevenueInter-company Operating RevenueTotal Revenues
 Contract Customers Other Revenues  Contract Customers Other Revenues
Segment:
Electric Utilities$397,592 $2,416 $12,333 $— $412,341 
Gas Utilities581,686 3,658 3,039 186 588,569 
Power Generation5,673 807 47,931 100 54,511 
Mining13,689 483 14,248 681 29,101 
Inter-company eliminations— — (77,551)(967)(78,518)
Total$998,640 $7,364 $— $— $1,006,004 

Six Months Ended June 30, 2020External Operating RevenueInter-company Operating Revenue Total Revenues
 Contract Customers Other Revenues  Contract Customers Other Revenues
Segment:
Electric Utilities$323,700 $1,850 $11,789 $— $337,339 
Gas Utilities514,111 6,220 1,552 — 521,883 
Power Generation3,097 792 48,088 111 52,088 
Mining13,494 700 15,755 672 30,621 
Inter-company eliminations— — (77,184)(783)(77,967)
Total$854,402 $9,562 $— $— $863,964 

Three Months Ended June 30,Six Months Ended June 30,
2021202020212020
Adjusted operating income:
Electric Utilities$35,568 $33,993 $57,381 $69,643 
Gas Utilities19,985 18,209 122,079 121,106 
Power Generation8,250 11,402 22,519 22,751 
Mining3,644 3,358 6,905 6,487 
Corporate and Other(181)(29)(3,303)131 
Operating income67,266 66,933 205,581 220,118 
Interest expense, net(38,202)(35,545)(75,802)(70,998)
Impairment of investment— — — (6,859)
Other income (expense), net(191)(1,863)75 490 
Income tax (expense)(586)(4,831)(1,080)(20,833)
Net income 28,287 24,694 128,774 121,918 
Net income attributable to noncontrolling interest(3,126)(3,728)(7,297)(7,778)
Net income available for common stock$25,161 $20,966 $121,477 $114,140