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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 $ 41,539 $ (8,668) $ 774,923 $ 11,823 $ 786,746
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                             119,573 119,573 3,776 123,349
Other comprehensive income (loss), net of related taxes:                                          
Loss in respect of derivative instruments designated for cash flow hedge                             91 91 91
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                             119,573 119,573 3,776 123,349
Currency translation adjustment                                        
Balance (in shares) at Dec. 31, 2015                             49,107            
Balance at Dec. 31, 2015                             $ 49 849,223 148,396 (7,667) 990,001 93,873 1,083,874
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                             93,930 93,930 7,302 101,232
Other comprehensive income (loss), net of related taxes:                                          
Loss in respect of derivative instruments designated for cash flow hedge                             87 87 87
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                             93,930 93,930 7,302 101,232
Currency translation adjustment                             (1,241) (1,241) (407) (1,648)
Balance (in shares) at Dec. 31, 2016                             49,667            
Balance at Dec. 31, 2016                             $ 50 869,463 216,644 (7,732) 1,078,425 91,582 1,170,007
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)
Other comprehensive income (loss), net of related taxes:                                          
Loss in respect of derivative instruments designated for cash flow hedge                             84 84 84
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)
Increase in noncontrolling interest in Opal Geo                             155,489 155,489 13,643 169,132
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 $ 351,622 $ (4,314) $ 1,236,137 $ 84,322 $ 1,320,459