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Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Revenues:      
Electricity $ 468,329 $ 436,292 $ 375,920
Product 224,483 226,299 218,724
Total revenues 692,812 662,591 594,644
Cost of revenues:      
Electricity 272,266 261,573 242,612
Product 152,094 130,223 133,753
Total cost of revenues 424,360 391,796 376,365
Gross profit 268,452 270,795 218,279
Operating expenses:      
Research and development expenses 3,157 2,762 1,780
Selling and marketing expenses 15,600 16,424 16,077
General and administrative expenses 42,881 46,710 34,782
Write-off of unsuccessful exploration activities 1,796 3,017 1,579
Operating income 205,018 201,882 164,061
Other income (expense):      
Interest income 988 971 297
Interest expense, net (54,142) (67,389) (72,577)
Derivatives and foreign currency transaction gains (losses) 2,654 (5,534) (1,622)
Income attributable to sale of tax benefits 17,878 16,503 25,431
Other non-operating expense, net (1,666) (5,345) (1,991)
Income from continuing operations before income taxes and equity in losses of investees 170,730 141,088 113,599
Income tax (provision) benefit 1,411 (31,837) 15,258
Equity in earnings (losses) of investees, net (1,957) (7,735) (5,508)
Income from continuing operations 170,184 101,516 123,349
Net income attributable to noncontrolling interest (14,695) (7,586) (3,776)
Net income attributable to the Company's stockholders 155,489 93,930 119,573
Comprehensive income:      
Net income 170,184 101,516 123,349
Other comprehensive income (loss), net of related taxes:      
Currency translation adjustments 3,440 (1,648)
Change in unrealized gains or losses in respect of the Company's share in derivatives instruments of unconsolidated investment 804 1,185 1,028
Loss in respect of derivative instruments designated for cash flow hedge 84 87 91
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge (73) (96) (118)
Comprehensive income 174,439 101,044 124,350
Comprehensive income attributable to noncontrolling interest (15,532) (7,179) (3,776)
Comprehensive income attributable to the Company's stockholders $ 158,907 $ 93,865 $ 120,574
Basic:      
Net income (in dollars per share) $ 3.10 $ 1.90 $ 2.46
Diluted:      
Net income (in dollars per share) $ 3.06 $ 1.87 $ 2.43
Weighted average number of shares used in computation of earnings per share attributable to the Company's stockholders:      
Basic (in shares) 50,110 49,469 48,562
Diluted (in shares) 50,769 50,140 49,187
Dividend per share declared (in dollars per share) $ 0.41 $ 0.52 $ 0.26