Note 19 - Business Segments (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

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

	Electricity		Product		ESMS			Consolidated
	(Dollars in thousands)
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		—			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
Year Ended December 31, 2018:
Revenues from external customers:
United States (1)		305,962		14,999		7,645			328,606
Foreign (2)		203,917		186,744		—			390,661
Net revenues from external customers	$	509,879	$	201,743	$	7,645		$	719,267
Intersegment revenues		—		48,817		—			48,817
Depreciation and amortization expense		126,181		4,311		1,741			132,233
Operating income (loss)		155,546		38,083		(8,519	)		185,110
Segment assets at period end (3) (*)		2,896,938		156,942		67,470			3,121,350
Expenditures for long-lived assets		219,803		9,993		28,725			258,521
* Including unconsolidated investments		71,983		—		—			71,983
Year Ended December 31, 2017:
Revenues from external customers	$	465,593	$	224,483	$	2,736		$	692,812
Intersegment revenues		—		109,040		—			109,040
Depreciation and amortization expense		109,928		3,470		1,748			115,146
Operating income (loss)		157,613		50,543		(3,138	)		205,018
Segment assets at period end (3) (*)		2,457,514		115,713		50,637			2,623,864
Expenditures for long-lived assets		252,581		6,653		—			259,234
* Including unconsolidated investments		34,084		—		—			34,084

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

	Year Ended December 31,
	2019			2018			2017
	(Dollars in thousands)
Revenues:
Total segment revenues	$	746,044		$	719,267		$	692,812
Intersegment revenues		84,614			48,817			109,040
Elimination of intersegment revenues		(84,614	)		(48,817	)		(109,040	)
Total consolidated revenues	$	746,044		$	719,267		$	692,812
Operating income:
Operating income	$	193,796		$	185,110		$	205,018
Interest income		1,515			974			988
Interest expense, net		(80,384	)		(70,924	)		(54,142	)
Derivatives and foreign currency transaction gains (losses)		624			(4,761	)		2,654
Income attributable to sale of tax benefits		20,872			19,003			17,878
Other non-operating income (expense), net		880			7,779			(1,666	)
Total consolidated income before income taxes and equity in earnings of investees	$	137,303		$	137,181		$	170,730

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

	Year Ended December 31,
	2019		2018		2017
	(Dollars in thousands)
Revenues from external customers attributable to: (1)
United States	$	377,956	$	328,606	$	301,132
Indonesia		—		4,379		28,968
Kenya		121,661		119,094		110,243
Turkey		88,938		168,699		125,166
Chile		25,540		980		8,895
Guatemala		28,624		27,975		27,991
New Zealand		31,222		10,451		33,395
Honduras		34,446		34,355		10,151
Other foreign countries		37,657		24,728		46,871
Consolidated total	$	746,044	$	719,267	$	692,812

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

	Year Ended December 31,
	2019		2018		2017
	(Dollars in thousands)
Long-lived assets (primarily power plants and related assets) located in:
United States	$	1,870,335	$	1,696,439	$	1,510,986
Kenya		284,526		301,956		340,970
Other foreign countries		224,676		222,872		281,333
Consolidated total	$	2,379,537	$	2,221,267	$	2,133,289

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

	Year Ended December 31,
	2019				2018				2017
	Revenues		%		Revenues		%		Revenues		%
	(Dollars in thousands)				(Dollars in thousands)				(Dollars in thousands)
Southern California Public Power (1)	$	133,725		17.9	$	109,208		15.2	$	70,100		10.1
Sierra Pacific Power Company and Nevada Power Company (1)(2)		125,486		16.8		116,149		16.1		125,424		18.1
KPLC (1)		121,661		16.3		119,094		16.6		110,243		15.9