Note 8 - Business Segments (Tables)

3 Months Ended

Mar. 31, 2020

Notes Tables

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

	Electricity		Product		ESMS			Consolidated
	(Dollars in thousands)
Three Months Ended March 31, 2020:
Revenues from external customers:
United States (1)	$	91,692	$	398	$	1,846		$	93,936
Foreign (2)		51,164		47,013		—			98,177
Net revenue from external customers		142,856		47,411		1,846			192,113
Intersegment revenue		—		8,656		—			8,656
Operating income (loss)		58,630		3,872		(1,445	)		61,057
Segment assets at period end (3) (*)		3,139,603		230,831		75,179			3,445,613
* Including unconsolidated investments		76,008		—		—			76,008
Three Months Ended March 31, 2019:
Revenues from external customers:
United States (1)	$	91,528	$	11,243	$	4,002		$	106,773
Foreign (2)		51,380		40,885		—			92,265
Net revenue from external customers		142,908		52,128		4,002			199,038
Intersegment revenue		—		18,261		—			18,261
Operating income		51,551		4,252		(2,078	)		53,725
Segment assets at period end (3) (*)		2,950,444		125,248		67,522			3,143,214
* Including unconsolidated investments		71,885		—		—			71,885

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

	Three Months Ended March 31,
	2020			2019
	(Dollars in thousands)
Revenues:
Total segment revenues	$	192,113		$	199,038
Intersegment revenues		8,656			18,261
Elimination of intersegment revenues		(8,656	)		(18,261	)
Total consolidated revenues	$	192,113		$	199,038
Operating income:
Operating income	$	61,057		$	53,725
Interest income		402			293
Interest expense, net		(17,273	)		(21,223	)
Derivatives and foreign currency transaction gains (losses)		393			472
Income attributable to sale of tax benefits		4,132			7,764
Other non-operating income (expense), net		78			91
Total consolidated income before income taxes and equity in income of investees	$	48,789		$	41,122