Note 9 - Business Segments (Tables)

9 Months Ended

Sep. 30, 2018

Notes Tables

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

	Electricity		Product		Other			Consolidated
	(Dollars in thousands)
Three Months Ended September 30, 2018:
Revenues from external customers:
United States (1)	$	64,905	$	281	$	1,150		$	66,336
Foreign (2)		51,986		48,158		—			100,144
Net revenue from external customers		116,891		48,439		1,150			166,480
Intersegment revenue		—		9,236		—			9,236
Segment assets at period end (3) (*)		2,859,354		125,881		74,348			3,059,583
* Including unconsolidated investments		67,739		—		—			67,739
Three Months Ended September 30, 2017:
Net revenue from external customers	$	110,876	$	44,912		1,397			157,185
Intersegment revenue		—		28,248		—			28,248
Operating income		37,279		7,765		(1,074	)		43,970
Segment assets at period end (3) (*)		2,319,083		131,883		52,772			2,503,738
* Including unconsolidated investments		25,367		—		—			25,367
Nine Months Ended September 30, 2018:
Revenues from external customers:
United States (1)	$	221,727	$	502	$	5,217		$	227,446
Foreign (2)		149,832		151,524		—			301,356
Net revenues from external customers		371,559		152,026		5,217			528,802
Intersegment revenues		—		45,516		—			45,516
Operating income		94,024		27,614		(4,510	)		117,128
Segment assets at period end (3) (*)		2,859,354		125,881		74,348			3,059,583
* Including unconsolidated investments		67,739		—		—			67,739
Nine Months Ended September 30, 2017:
Net revenues from external customers	$	337,548	$	186,621	$	2,278		$	526,447
Intersegment revenues		—		61,026		—			61,026
Operating income		116,191		43,398		(2,971	)		156,618
Segment assets at period end (3) (*)		2,319,083		131,883		52,772			2,503,738
* Including unconsolidated investments		25,367		—		—			25,367

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

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Revenue:
Total segment revenue	$	166,480		$	157,185		$	528,802		$	526,447
Intersegment revenue		9,236			28,248			45,516			61,026
Elimination of intersegment revenue		(9,236	)		(28,248	)		(45,516	)		(61,026	)
Total consolidated revenue	$	166,480		$	157,185		$	528,802		$	526,447
Operating income:
Operating income	$	25,902		$	43,970		$	117,128		$	156,618
Interest income		214			255			516			861
Interest expense, net		(18,700	)		(11,692	)		(48,890	)		(41,155	)
Derivatives and foreign currency transaction gains (losses)		(383	)		(1,001	)		(2,511	)		2,040
Income attributable to sale of tax benefits		4,066			3,506			14,983			14,019
Other non-operating income (expense), net		309			(1,592	)		7,662			(1,678	)
Total consolidated income before income taxes and equity in income of investees	$	11,408		$	33,446		$	88,888		$	130,705