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Note 9 - Business Segments (Tables)

6 Months Ended

Jun. 30, 2021

Notes Tables

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

		Electricity				Product				Energy Storage				Consolidated
		(Dollars in thousands)
Three Months Ended June 30, 2021:
Revenues from external customers:
United States ⁽¹⁾		$	87,564			$	647			$	5,627			$	93,838
Foreign⁽²⁾			46,300				6,763				—				53,063
Net revenue from external customers			133,864				7,410				5,627				146,901
Intersegment revenues ⁽⁴⁾			—				51,038				—				—
Operating income (loss)			30,018				(427	)			(972	)			28,619
Segment assets at period end ^{(3) (*)}			3,530,256				122,868				165,426				3,818,550
* Including unconsolidated investments			103,890				—				—				103,890

Three Months Ended June 30, 2020:
Revenues from external customers:
United States ⁽¹⁾		$	80,427			$	2,269			$	2,514			$	85,210
Foreign⁽²⁾			48,258				41,432				—				89,690
Net revenue from external customers			128,685				43,701				2,514				174,900
Intersegment revenues ⁽⁴⁾			—				50,453				—				—
Operating income (loss)			45,875				3,803				(1,603	)			48,075
Segment assets at period end^{(3) (*)}			3,150,770				190,474				77,133				3,418,377
* Including unconsolidated investments			84,414				—				—				84,414

Six Months Ended June 30, 2021:
Revenues from external customers:
United States ⁽¹⁾		$	186,540			$	2,500			$	18,348			$	207,388
Foreign ⁽²⁾			92,312				13,553				—				105,865
Net revenue from external customers			278,852				16,053				18,348				313,253
Intersegment revenues ⁽⁴⁾			—				76,372				—				—
Operating income (loss)			77,767				(1,638	)			2,379				78,508
Segment assets at period end ^{(3) (*)}			3,530,256				122,868				165,426				3,818,550
* Including unconsolidated investments			103,890				—				—				103,890

Six Months Ended June 30, 2020:
Revenues from external customers:
United States ⁽¹⁾		$	172,119			$	2,667			$	4,360			$	179,146
Foreign⁽²⁾			99,422				88,445				—				187,867
Net revenue from external customers			271,541				91,112				4,360				367,013
Intersegment revenues ⁽⁴⁾			—				59,109				—				—
Operating income (loss)			104,505				7,675				(3,048	)			109,132
Segment assets at period end^{(3) (*)}			3,150,770				190,474				77,133				3,418,377
* Including unconsolidated investments			84,414				—				—				84,414

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

		Three Months Ended June 30,								Six Months Ended June 30,
		2021				2020				2021				2020
		(Dollars in thousands)								(Dollars in thousands)
Revenues:
Total segment revenues		$	146,901			$	174,900			$	313,253			$	367,013
Intersegment revenues			51,038				50,453				76,372				59,109
Elimination of intersegment revenues			(51,038	)			(50,453	)			(76,372	)			(59,109	)
Total consolidated revenues		$	146,901			$	174,900			$	313,253			$	367,013

Operating income:
Operating income		$	28,619			$	48,075			$	78,508			$	109,132
Interest income			808				441				1,071				843
Interest expense, net			(18,626	)			(19,785	)			(37,642	)			(37,058	)
Derivatives and foreign currency transaction gains (losses)			658				671				(16,208	)			1,064
Income attributable to sale of tax benefits			7,420				5,672				13,775				9,804
Other non-operating income (expense), net			(21	)			304				(352	)			382
Total consolidated income before income taxes and equity in income of investees		$	18,858			$	35,378			$	39,152			$	84,167