Note 9 - Business Segments (Tables)

3 Months Ended

Mar. 31, 2019

Notes Tables

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

	Electricity		Product		Other			Consolidated
	(Dollars in thousands)
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 revenues from external customers		142,908		52,128		4,002			199,038
Intersegment revenues		—		18,261		—			18,261
Operating income (loss)		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
Three Months Ended March 31, 2018:
Revenues from external customers:
United States (1)	$	83,683	$	194	$	2,862		$	86,739
Foreign (2)		48,806		48,478		—			97,284
Net revenues from external customers		132,489		48,672		2,862			184,023
Intersegment revenues		—		24,827		—			24,827
Operating income		46,412		9,553		(1,372	)		54,593
Segment assets at period end (3) (*)		2,542,154		114,815		53,848			2,710,817
* Including unconsolidated investments		63,109		—		—			63,109

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

	Three Months Ended March 31,
	2019			2018
		(Dollars in thousands)
Revenue:
Total segment revenue	$	199,038		$	184,023
Intersegment revenue		18,261			24,827
Elimination of intersegment revenue		(18,261	)		(24,827	)
Total consolidated revenue	$	199,038		$	184,023
Operating income:
Operating income	$	53,725		$	54,593
Interest income		293			113
Interest expense, net		(21,223	)		(14,344	)
Derivatives and foreign currency transaction gains (losses)		472			(1,599	)
Income attributable to sale of tax benefits		7,764			7,361
Other non-operating income (expense), net		91			(20	)
Total consolidated income from operations before income taxes and equity in earnings of investees	$	41,122		$	46,104