Note 18 - Business Segments (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

Schedule of Segment Reporting Information, by Segment [Table Text Block]

	Electricity		Product			Energy Storage			Consolidated
	(Dollars in thousands)
Year Ended December 31, 2021:
Revenues from external customers:
United States (1)	$	404,303	$	5,414		$	30,393		$	440,110
Foreign (2)		181,468		41,506			—			222,974
Net revenues from external customers		585,771		46,920			30,393			663,084
Intersegment revenues		—		129,589			—			—
Depreciation and amortization expense		164,490		7,719			10,763			182,972
Operating income (loss)		171,550		(3,641	)		1,448			169,357
Segment assets at period end (3) (*)		4,142,341		113,817			169,520			4,425,678
Expenditures for long-lived assets		383,307		10,687			25,278			419,272
* Including unconsolidated investments		105,886		—			—			105,886
Year Ended December 31, 2020:
Revenues from external customers:
United States (1)		341,399		5,800			15,824			363,023
Foreign (2)		199,994		142,325			—			342,319
Net revenues from external customers	$	541,393	$	148,125		$	15,824		$	705,342
Intersegment revenues		—		113,200			—			—
Depreciation and amortization expense		144,357		6,010			6,245			156,612
Operating income (loss)		205,256		13,145			(4,388	)		214,013
Segment assets at period end (3) (*)		3,607,384		145,911			135,692			3,888,987
Expenditures for long-lived assets		267,843		18,011			34,884			320,738
* Including unconsolidated investments		98,217		—			—			98,217
Year Ended December 31, 2019:
Revenues from external customers:
United States (1)		333,797		30,562			13,597			377,956
Foreign (2)		206,536		160,447			1,105			368,088
Net revenues from external customers		540,333		191,009			14,702			746,044
Intersegment revenues		—		84,614			—			—
Depreciation and amortization expense		138,426		5,308			5,027			148,761
Operating income (loss)		177,192		23,180			(6,576	)		193,796
Segment assets at period end (3) (*)		3,044,909		126,018			79,567			3,250,494
Expenditures for long-lived assets		259,898		9,156			10,932			279,986
* Including unconsolidated investments		81,140		—			—			81,140

Reconciliation of Operating Profit (Loss) from Segments to Consolidated [Table Text Block]

	Year Ended December 31,
	2021			2020			2019
	(Dollars in thousands)
Revenues:
Total segment revenues	$	663,084		$	705,342		$	746,044
Intersegment revenues		129,589			113,200			84,614
Elimination of intersegment revenues		(129,589	)		(113,200	)		(84,614	)
Total consolidated revenues	$	663,084		$	705,342		$	746,044
Operating income (expense):
Operating income	$	169,357		$	214,013		$	193,796
Interest income		2,124			1,717			1,515
Interest expense, net		(82,658	)		(77,953	)		(80,384	)
Derivatives and foreign currency transaction gains (losses)		(14,720	)		3,802			624
Income attributable to sale of tax benefits		29,582			25,720			20,872
Other non-operating income (expense), net		(134	)		1,418			880
Total consolidated income before income taxes and equity in earnings (losses) of investees	$	103,551		$	168,717		$	137,303

Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]

	Year Ended December 31,
	2021		2020		2019
	(Dollars in thousands)
Revenues from external customers attributable to:
United States	$	440,110	$	363,023	$	377,956
Indonesia		8,056		—		0
Kenya		102,844		115,474		121,661
Turkey		2,723		65,535		88,938
Chile		7,035		32,418		25,540
Guatemala		26,868		27,391		28,624
New Zealand		6,770		34,985		31,222
Honduras		35,233		35,197		34,446
Other foreign countries		33,445		31,319		37,657
Consolidated total	$	663,084	$	705,342	$	746,044

Schedule of Disclosure on Geographic Areas, Long-Lived Assets in Individual Foreign Countries by Country [Table Text Block]

	Year Ended December 31,
	2021		2020		2019
	(Dollars in thousands)
Long-lived assets (primarily power plants and related assets) located in:
United States	$	2,527,429	$	2,084,021	$	1,870,335
Kenya		297,427		289,266		284,526
Other foreign countries		217,371		232,953		224,676
Consolidated total	$	3,042,227	$	2,606,240	$	2,379,537

Schedule of Revenue by Major Customers by Reporting Segments [Table Text Block]

	Year Ended December 31,
	2021				2020				2019
	Revenues		%		Revenues		%		Revenues		%
	(Dollars in thousands)				(Dollars in thousands)				(Dollars in thousands)
Southern California Public Power (1)	$	157,318		23.7	$	145,450		20.6	$	133,725		17.9
Sierra Pacific Power Company and Nevada Power Company (1)(2)		120,206		18.1		123,734		17.5		125,486		16.8
KPLC (1)		102,844		15.5		115,474		16.4		121,661		16.3