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BUSINESS SEGMENTS (Tables)
 6 Months Ended
Jun. 30, 2024
Segment Reporting [Abstract]  
Schedule of Segment Reporting Information, by Segment
Summarized financial information concerning the Company’s reportable segments is shown in the following tables, including the Company's disaggregated revenues from contracts with customers:
ElectricityProductEnergy StorageConsolidated
(Dollars in thousands)
Three Months Ended June 30, 2024:
Revenues from external customers:
United States (1)
$119,695 $1,615 $8,908 $130,218 
Foreign (2)
46,531 36,214 — 82,745 
Net revenue from external customers 166,226 37,829 8,908 212,963 
Intersegment revenues (4)
— 26,907 — — 
Operating income (loss) 35,414 1,026 (1,313)35,127 
Segment assets at period end (3) (*)
4,955,806 192,092 358,904 5,506,802 
* Including unconsolidated investments 129,664 — — 129,664 
Three Months Ended June 30, 2023:
Revenues from external customers:
United States (1)
$106,209 $2,253 $6,014 $114,476 
Foreign (2)
49,115 31,205 — 80,320 
Net revenue from external customers 155,324 33,458 6,014 194,796 
Intersegment revenues (4)
— 12,918 — — 
Operating income (loss)28,661 (2,297)(2,140)24,224 
Segment assets at period end (3) (*)
4,576,437 182,437 251,770 5,010,644 
* Including unconsolidated investments 126,451 — — 126,451 
Six Months Ended June 30, 2024:
Revenues from external customers:
United States (1)
$263,511 $2,491 $16,989 $282,991 
Foreign (2)
93,968 60,170 — 154,138 
Net revenue from external customers 357,479 62,661 16,989 437,129 
Intersegment revenues (4)
— 47,504 — — 
Operating income (loss) 88,095 1,868 (2,253)87,710 
Segment assets at period end (3) (*)
4,955,806 192,092 358,904 5,506,802 
* Including unconsolidated investments 129,664 — — 129,664 
Six Months Ended June 30, 2023:
Revenues from external customers:
United States (1)
$228,620 $3,694 $10,894 $243,208 
Foreign (2)
97,014 39,806 — 136,820 
Net revenue from external customers 325,634 43,500 10,894 380,028 
Intersegment revenues (4)
— 20,690 — — 
Operating income (loss)85,669 (3,802)(4,477)77,390 
Segment assets at period end (3) (*)
4,576,437 182,437 251,770 5,010,644 
* Including unconsolidated investments 126,451 — — 126,451 
(1)Electricity segment revenues in the United States are all accounted for under lease accounting except for $37.5 million, and $82.3 million in the three and six months ended June 30, 2024, respectively, and $30.2 million, and $62.9 million in the three and six months ended June 30, 2023, respectively, that are accounted for under ASC 606. Product and Energy Storage segment revenues in the United States are accounted for under ASC 606, Revenue from Contracts with Customers ("ASC 606"), except for Energy Storage revenues of $0.7 million, and $1.4 million for the three and six months ended June 30, 2024, respectively, and none for the three and six months ended June 30, 2023, that are accounted for under lease accounting.
(2)Electricity segment revenues in foreign countries are all accounted for under lease accounting. Product segment revenues in foreign countries are all accounted for under ASC 606.
(3)Electricity segment assets include goodwill in the amount of $146.4 million, and $85.8 million as of June 30, 2024 and 2023, respectively. Energy Storage segment assets include goodwill in the amount of $4.6 million and $4.6 million as of June 30, 2024 and 2023, respectively. No goodwill is included in the Product segment assets as of June 30, 2024 and 2023.
(4)Intersegment revenues are fully eliminated in consolidation.
Reconciliation of Operating Profit (Loss) from Segments to Consolidated
Reconciling information between reportable segments and the Company’s consolidated totals is shown in the following table:

Three Months Ended June 30,Six Months Ended June 30,
2024202320242023
(Dollars in thousands)(Dollars in thousands)
Revenues:
Total segment revenues $212,963 $194,796 $437,129 $380,028 
Intersegment revenues26,907 12,918 47,504 20,690 
Elimination of intersegment revenues (26,907)(12,918)(47,504)(20,690)
Total consolidated revenues $212,963 $194,796 $437,129 $380,028 
Operating income:
Operating income $35,127 $24,224 $87,710 $77,390 
Interest income 2,604 4,942 4,443 6,793 
Interest expense, net (33,716)(24,393)(64,684)(48,024)
Derivatives and foreign currency transaction gains (losses) (332)(1,272)(1,914)(3,209)
Income attributable to sale of tax benefits 15,798 14,979 33,274 27,545 
Other non-operating income, net 74 79 100 139 
Total consolidated income before income taxes and equity in income of investees
$19,555 $18,559 $58,929 $60,634