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Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($)
shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Revenues:      
Revenue [1] $ 746,044 $ 719,267 $ 692,812
Cost of revenues:      
Cost of revenues 476,721 448,832 424,360
Gross profit 269,323 270,435 268,452
Operating expenses:      
Research and development expenses 4,647 4,183 3,157
Selling and marketing expenses 15,047 19,802 15,600
General and administrative expenses 55,833 47,750 42,881
Impairment charge 0 13,464 0
Write-off of unsuccessful exploration activities 0 126 1,796
Operating income 193,796 185,110 205,018
Other income (expense):      
Interest income 1,515 974 988
Interest expense, net (80,384) (70,924) (54,142)
Derivatives and foreign currency transaction gains (losses) 624 (4,761) 2,654
Income attributable to sale of tax benefits 20,872 19,003 17,878
Other non-operating income (expense), net 880 7,779 (1,666)
Income from operations before income tax and equity in earnings (losses) of investees 137,303 137,181 170,730
Income tax (provision) benefit (45,613) (34,733) (21,664)
Equity in earnings (losses) of investees, net 1,853 7,663 (1,957)
Net income 93,543 110,111 147,109
Net income attributable to noncontrolling interest (5,448) (12,145) (14,695)
Net income attributable to the Company's stockholders 88,095 97,966 132,414
Comprehensive income:      
Net income 93,543 110,111 147,109
Other comprehensive income (loss), net of related taxes:      
Change in foreign currency translation adjustments (1,810) (1,831) 3,440
Change in unrealized gains or losses in respect of the Company's share in derivatives instruments of unconsolidated investment (3,417) 2,235 804
Change in respect of derivative instruments designated for cash flow hedge 75 81 135
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge (31) (57) (73)
Comprehensive income 88,360 110,539 151,415
Comprehensive income attributable to noncontrolling interest (5,120) (11,666) (15,532)
Comprehensive income attributable to the Company's stockholders $ 83,240 $ 98,873 $ 135,883
Basic:      
Net income (in dollars per share) $ 1.73 $ 1.93 $ 2.64
Diluted:      
Net income (in dollars per share) $ 1.72 $ 1.92 $ 2.61
Weighted average number of shares used in computation of earnings per share attributable to the Company's stockholders:      
Basic (in shares) 50,867 50,643 50,110
Diluted (in shares) 51,227 50,969 50,769
Electricity [Member]      
Revenues:      
Revenue $ 540,333 $ 509,879 $ 465,593
Cost of revenues:      
Cost of revenues 312,835 298,255 266,840
Product [Member]      
Revenues:      
Revenue 191,009 201,743 224,483
Cost of revenues:      
Cost of revenues 145,974 140,697 152,094
Energy Storage and Management Services [Member]      
Revenues:      
Revenue 14,702 7,645 2,736
Cost of revenues:      
Cost of revenues $ 17,912 $ 9,880 $ 5,426
[1] Revenues as reported in the geographic area in which they originate.