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Consolidated Statements of Equity - USD ($) shares in Thousands, $ in Thousands | Ormat Nevada ORTP LLC [Member] Common Stock [Member] | Ormat Nevada ORTP LLC [Member] Additional Paid-in Capital [Member] | Ormat Nevada ORTP LLC [Member] Retained Earnings [Member] | Ormat Nevada ORTP LLC [Member] AOCI Attributable to Parent [Member] | Ormat Nevada ORTP LLC [Member] Parent [Member] | Ormat Nevada ORTP LLC [Member] Noncontrolling Interest [Member] | Ormat Nevada ORTP LLC [Member] | OPC LLC [Member] Common Stock [Member] | OPC LLC [Member] Additional Paid-in Capital [Member] | OPC LLC [Member] Retained Earnings [Member] | OPC LLC [Member] AOCI Attributable to Parent [Member] | OPC LLC [Member] Parent [Member] | OPC LLC [Member] Noncontrolling Interest [Member] | OPC LLC [Member] | Common Stock [Member] | Additional Paid-in Capital [Member] | Retained Earnings [Member] | AOCI Attributable to Parent [Member] | Parent [Member] | Noncontrolling Interest [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,537 |  |  |  |  |  |
Balance at Dec. 31, 2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 46 | $ 742,006 | $ 44,670 | $ (9,221) | $ 777,501 | $ 11,823 | $ 789,324
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,955 |  |  | 3,955 |  | 3,955
Exercise of options by employees and directors (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 574 |  |  |  |  |  |
Exercise of options by employees and directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,085 |  |  | 6,085 |  | 6,085
Share exchange with Parent (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,996 |  |  |  |  |  |
Share exchange with Parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 3 | 26,012 |  |  | 26,015 |  | 26,015
Cash paid to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,196) | (7,196)
Cash dividend declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (12,716) |  | (12,716) |  | (12,716)
Issuance of shares to noncontrolling interest, net of transaction costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 71,165 |  |  | 71,165 | 85,470 | 156,635
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120,372 |  | 120,372 | 3,776 | 124,148
Other comprehensive income (loss), net of related taxes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss in respect of derivative instruments designated for cash flow hedge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 147 | 147 |  | 147
Change in unrealized gains or losses in respect of the Company's share in derivatives instruments of unconsolidated investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,028 | 1,028 |  | 1,028
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (118) | (118) |  | (118)
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,955 |  |  | 3,955 |  | 3,955
Exercise of options by employees and directors (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 574 |  |  |  |  |  |
Exercise of options by employees and directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,085 |  |  | 6,085 |  | 6,085
Cash paid to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (7,196) | (7,196)
Cash dividend declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (12,716) |  | (12,716) |  | (12,716)
Issuance of shares to noncontrolling interest, net of transaction costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 71,165 |  |  | 71,165 | 85,470 | 156,635
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 120,372 |  | 120,372 | 3,776 | 124,148
Currency translation adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance (in shares) at Dec. 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49,107 |  |  |  |  |  |
Balance at Dec. 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 49 | 849,223 | 152,326 | (8,164) | 993,434 | 93,873 | 1,087,307
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,157 |  |  | 5,157 |  | 5,157
Exercise of options by employees and directors (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 560 |  |  |  |  |  |
Exercise of options by employees and directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1 | 7,249 |  |  | 7,250 |  | 7,250
Cash paid to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (57,391) | (57,391)
Cash dividend declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (25,682) |  | (25,682) |  | (25,682)
Issuance of shares to noncontrolling interest, net of transaction costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,834 |  |  | 7,834 | 36,268 | 44,102
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 88,708 |  | 88,708 | 7,302 | 96,010
Other comprehensive income (loss), net of related taxes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss in respect of derivative instruments designated for cash flow hedge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 141 | 141 |  | 141
Change in unrealized gains or losses in respect of the Company's share in derivatives instruments of unconsolidated investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,185 | 1,185 |  | 1,185
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (96) | (96) |  | (96)
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5,157 |  |  | 5,157 |  | 5,157
Exercise of options by employees and directors (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 560 |  |  |  |  |  |
Exercise of options by employees and directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1 | 7,249 |  |  | 7,250 |  | 7,250
Cash paid to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (57,391) | (57,391)
Cash dividend declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (25,682) |  | (25,682) |  | (25,682)
Increase in noncontrolling interest in Guadeloupe |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,240 | 8,240
Increase in noncontrolling interest in Opal Geo |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 3,697 | 3,697
Issuance of shares to noncontrolling interest, net of transaction costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7,834 |  |  | 7,834 | 36,268 | 44,102
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 88,708 |  | 88,708 | 7,302 | 96,010
Currency translation adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (1,241) | (1,241) | (407) | (1,648)
Balance (in shares) at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49,667 |  |  |  |  |  |
Balance at Dec. 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50 | 869,463 | 215,352 | (8,175) | 1,076,690 | 91,582 | 1,168,272
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,760 |  |  | 8,760 |  | 8,760
Exercise of options by employees and directors (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 942 |  |  |  |  |  |
Exercise of options by employees and directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1 | 16,111 |  |  | 16,112 |  | 16,112
Cash paid to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (21,313) | (21,313)
Cash dividend declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (20,511) |  | (20,511) |  | (20,511)
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 132,414 |  | 132,414 | 13,643 | 146,057
Other comprehensive income (loss), net of related taxes: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss in respect of derivative instruments designated for cash flow hedge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 135 | 135 |  | 135
Change in unrealized gains or losses in respect of the Company's share in derivatives instruments of unconsolidated investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 804 | 804 |  | 804
Amortization of unrealized gains in respect of derivative instruments designated for cash flow hedge |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (73) | (73) |  | (73)
Stock-based compensation |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8,760 |  |  | 8,760 |  | 8,760
Exercise of options by employees and directors (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 942 |  |  |  |  |  |
Exercise of options by employees and directors |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1 | 16,111 |  |  | 16,112 |  | 16,112
Cash paid to noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (21,313) | (21,313)
Cash dividend declared |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | (20,511) |  | (20,511) |  | (20,511)
Net income |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 132,414 |  | 132,414 | 13,643 | 146,057
Currency translation adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,603 | 2,603 | 837 | 3,440
Buyout of Class B membership |  | $ 2,913 |  |  | $ 2,913 | $ (6,964) | $ (4,051) |  | $ (8,469) |  |  | $ (8,469) | $ 6,537 | $ (1,932) |  |  |  |  |  |  |
Balance (in shares) at Dec. 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50,609 |  |  |  |  |  |
Balance at Dec. 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 51 | $ 888,778 | $ 327,255 | $ (4,706) | $ 1,211,378 | $ 84,322 | $ 1,295,700

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