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Note 9 - Business Segments (Tables)

6 Months Ended

Jun. 30, 2014

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

	Electricity		Product		Consolidated
	(Dollars in thousands)
Three Months Ended June 30, 2014:
Net revenues from external customers	$	91,692	$	35,911	$	127,603
Intersegment revenues		—		15,742		15,742
Operating income		9,521		12,809		22,330
Segment assets at period end *		2,027,211		117,718		2,144,929
* Including unconsolidated investments		3,308		—		3,308
Three Months Ended June 30, 2013:
Net revenues from external customers	$	87,713	$	64,966	$	152,679
Intersegment revenues		—		18,821		18,821
Operating income		22,639		15,223		37,862
Segment assets at period end *		2,039,219		98,681		2,137,900
* Including unconsolidated investments		3,524		—		3,524

Six Months Ended June 30, 2014:
Net revenues from external customers	$	186,509	$	83,530	$	270,039
Intersegment revenues		—		36,336		36,336
Operating income		40,439		24,462		64,901
Segment assets at period end *		2,027,211		117,718		2,144,929
* Including unconsolidated investments		3,308		—		3,308
Six Months Ended June 30, 2013:
Net revenues from external customers	$	156,011	$	115,574	$	271,585
Intersegment revenues		—		25,402		25,402
Operating income		21,325		24,221		45,546
Segment assets at period end *		2,039,219		98,681		2,137,900
* Including unconsolidated investments		3,524		—		3,524

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

	Three Months Ended June 30,						Six Months Ended June 30,
	2014			2013			2014			2013
	(Dollars in thousands)						(Dollars in thousands)
Operating income	$	22,330		$	37,862		$	64,901		$	45,546
Interest income		90			87			201			128
Interest expense, net		(22,072	)		(17,504	)		(42,590	)		(33,367	)
Foreign currency translation and transaction gains (losses)		(55	)		904			(693	)		2,586
Income attributable to sale of tax benefits		6,130			5,783			12,847			9,315
Gain from sale of property, plant and equipment		7,628			—			7,628			—
Other non-operating income, net		343			29			406			1,446
Total income, before income taxes, discontinued operations and equity in income (losses) of investees	$	14,394		$	27,161		$	42,700		$	25,654

- Definition

Tabular disclosure of the profit or loss and total assets for each reportable segment. An entity discloses certain information on each reportable segment if the amounts (a) are included in the measure of segment profit or loss reviewed by the chief operating decision maker or (b) are otherwise regularly provided to the chief operating decision maker, even if not included in that measure of segment profit or loss.

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