Note 9 - Business Segments (Tables)

3 Months Ended

Mar. 31, 2014

Segment Reporting [Abstract]

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

	Electricity			Product		Consolidated
	(Dollars in thousands)
Three Months Ended March 31, 2014:
Net revenues from external customers	$	94,817		$	47,619	$	142,436
Intersegment revenues		—			20,594		20,594
Operating income		30,918			11,653		42,571
Segment assets at period end *		2,003,991			130,356		2,134,347
* Including unconsolidated investments		7,510			—		7,510
Three Months Ended March 31, 2013, as revised:
Net revenues from external customers	$	68,298		$	50,608	$	118,906
Intersegment revenues		—			6,581		6,581
Operating income (loss)		(1,278	)		8,962		7,684
Segment assets at period end *		2,046,817			96,751		2,143,568
* Including unconsolidated investments		2,789			—		2,789

Reconciliation of Revenue and Operating Income from Segments to Consolidated [Text Block]

	Three Months Ended March 31,
	2014			2013, As revised
	(Dollars in thousands)
Operating income	$	42,571		$	7,684
Interest income		111			41
Interest expense, net		(20,518	)		(15,863	)
Foreign currency translation and transaction gains (losses)		(638	)		1,682
Income attributable to sale of equity interest		6,717			3,532
Other non-operating (expense), net		63			1,417
Total income (loss), before income taxes and equity in losses of investees	$	28,306		$	(1,507	)