Quarterly report [Sections 13 or 15(d)]

IMPACT OF ACCOUNTING METHOD CHANGE FOR INVESTMENT TAX CREDITS - Statements of Operations Line Items Impacted by Change (Details)

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IMPACT OF ACCOUNTING METHOD CHANGE FOR INVESTMENT TAX CREDITS - Statements of Operations Line Items Impacted by Change (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2026
Jun. 30, 2026
Mar. 31, 2026
Dec. 31, 2025
Sep. 30, 2025
Jun. 30, 2025
Mar. 31, 2025
Jun. 30, 2026
Jun. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
Dec. 31, 2025
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Cost of revenues $ 471,710 $ 426,984 $ 347,823 $ 489,285 $ 443,687 $ 400,955 $ 302,939   $ 703,895 $ 1,246,517 $ 1,147,582 $ 1,636,866
Income tax benefit (12,255) (206) (3,939) (71,487) (61,150) (42,193) 25,265   (16,928) (16,400) (78,078) (149,565)
Net income 46,802 17,423 (16,455) 87,433 77,283 52,782 (31,712) $ 968 21,069 47,770 98,353 185,787
Net income attributable to non-controlling interests and redeemable non-controlling interests (14,921) (10,126) (3,837) (6,489) (3,245) (2,591) 186   (2,405) (28,884) (5,650) (12,140)
Net income attributable to common shareholders $ 31,881 $ 7,297 $ (20,292) $ 80,944 $ 74,038 $ 50,191 $ (31,526)   $ 18,664 $ 18,886 $ 92,703 $ 173,647
Net income per share attributable to common shareholders:                        
Basic (in usd per share) $ 0.60 $ 0.14 $ (0.39) $ 1.50 $ 1.40 $ 0.95 $ (0.60) $ (0.24) $ 0.35 $ 0.36 $ 1.76 $ 3.24
Diluted (in usd per share) 0.59 $ 0.14 $ (0.39) $ 1.51 $ 1.39 $ 0.95 $ (0.60) $ (0.24) $ 0.35 $ 0.35 $ 1.74 $ 3.23
Change In Accounting Principle, Investment Tax Credits for Energy Assets                        
Net income per share attributable to common shareholders:                        
Basic (in usd per share) 0.60                      
Diluted (in usd per share) $ 0.59                      
Original Amount | Change In Accounting Principle, Investment Tax Credits for Energy Assets                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Cost of revenues $ 468,883 $ 424,157 $ 344,996 $ 486,619 $ 441,658 $ 398,926 $ 300,910 $ 769,153 $ 699,836 $ 1,238,036 $ 1,141,494 $ 1,628,113
Income tax benefit (28,224) 137 (3,184) (6,310) (3,678) (2,900) 1,188 (3,047) (1,712) (31,271) (5,390) (11,700)
Net income 65,598 19,907 (14,383) 24,922 21,840 15,518 (5,606) 5,524 9,912 71,122 31,753 56,675
Net income attributable to non-controlling interests and redeemable non-controlling interests (14,962) (10,189) (3,900) (6,552) (3,308) (2,654) 123 (14,089) (2,531) (29,050) (5,839) (12,391)
Net income attributable to common shareholders $ 50,636 $ 9,718 $ (18,283) $ 18,370 $ 18,532 $ 12,864 $ (5,483) $ (8,565) $ 7,381 $ 42,072 $ 25,914 $ 44,284
Net income per share attributable to common shareholders:                        
Basic (in usd per share) $ 0.95 $ 0.18 $ (0.35) $ 0.35 $ 0.35 $ 0.24 $ (0.10) $ (0.16) $ 0.14 $ 0.80 $ 0.49 $ 0.84
Diluted (in usd per share) $ 0.94 $ 0.18 $ (0.35) $ 0.34 $ 0.35 $ 0.24 $ (0.10) $ (0.16) $ 0.14 $ 0.79 $ 0.49 $ 0.83
Effect of Change | Change In Accounting Principle, Investment Tax Credits for Energy Assets                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Cost of revenues $ 2,827 $ 2,827 $ 2,827 $ 2,666 $ 2,029 $ 2,029 $ 2,029 $ 5,654 $ 4,059 $ 8,481 $ 6,088 $ 8,753
Income tax benefit 15,969 (343) (755) (65,177) (57,472) (39,293) 24,077 (1,098) (15,216) 14,871 (72,688) (137,865)
Net income (18,796) (2,484) (2,072) 62,511 55,444 37,264 (26,106) (4,556) 11,157 (23,352) 66,600 129,112
Net income attributable to non-controlling interests and redeemable non-controlling interests 41 63 63 63 63 63 63 126 126 166 189 251
Net income attributable to common shareholders $ (18,755) $ (2,421) $ (2,009) $ 62,574 $ 55,507 $ 37,327 $ (26,043) $ (4,430) $ 11,283 $ (23,186) $ 66,789 $ 129,363
Net income per share attributable to common shareholders:                        
Basic (in usd per share) $ (0.35) $ (0.04) $ (0.04) $ 1.15 $ 1.05 $ 0.71 $ (0.50) $ (0.08) $ 0.21 $ (0.44) $ 1.27 $ 2.40
Diluted (in usd per share) $ (0.35) $ (0.04) $ (0.04) $ 1.17 $ 1.04 $ 0.71 $ (0.50) $ (0.08) $ 0.21 $ (0.44) $ 1.25 $ 2.40
As Revised | Change In Accounting Principle, Investment Tax Credits for Energy Assets                        
New Accounting Pronouncements or Change in Accounting Principle [Line Items]                        
Cost of revenues               $ 774,807        
Income tax benefit               (4,145)        
Net income         $ 77,284     968        
Net income attributable to non-controlling interests and redeemable non-controlling interests               (13,963)        
Net income attributable to common shareholders         $ 74,039     $ (12,995)