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Note 18 - Income Taxes (Details) - Significant Components of Deferred Income Tax Expense (Benefit) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Significant Components of Deferred Income Tax Expense (Benefit) [Abstract]      
Deferred tax expense (exclusive of the effect of other components listed below) $ (8,993)ora_DeferredTaxExpenseBenefit $ (71,052)ora_DeferredTaxExpenseBenefit $ 23,802ora_DeferredTaxExpenseBenefit
Write-off of power plants     (90,720)ora_DeferredIncomeTaxExpenseBenefitWriteoffOfPlants
Usage (benefit) of operating loss carryforwards - US 7,764ora_DeferredIncomeTaxExpenseBenefitOperatingLossCarryforwards 11,672ora_DeferredIncomeTaxExpenseBenefitOperatingLossCarryforwards 26,907ora_DeferredIncomeTaxExpenseBenefitOperatingLossCarryforwards
Change in valuation allowance 3,526ora_DeferredIncomeTaxExpenseBenefitChangeInValuationAllowance (1,787)ora_DeferredIncomeTaxExpenseBenefitChangeInValuationAllowance 16,877ora_DeferredIncomeTaxExpenseBenefitChangeInValuationAllowance
Change in foreign income tax 13,135ora_DeferredIncomeTaxExpenseBenefitChangeInForeignIncomeTax 10,458ora_DeferredIncomeTaxExpenseBenefitChangeInForeignIncomeTax 8,257ora_DeferredIncomeTaxExpenseBenefitChangeInForeignIncomeTax
Change in lease transaction 2,136ora_ChangeInLeaseTransactDeferredIncomeTaxExpenseBenefitChangeInLeaseTransaction 974ora_ChangeInLeaseTransactDeferredIncomeTaxExpenseBenefitChangeInLeaseTransaction 1,170ora_ChangeInLeaseTransactDeferredIncomeTaxExpenseBenefitChangeInLeaseTransaction
Change in tax monetization transaction 5,184ora_DeferredIncomeTaxExpenseBenefitChangeInTaxMonetizationTransaction 46,051ora_DeferredIncomeTaxExpenseBenefitChangeInTaxMonetizationTransaction 5,353ora_DeferredIncomeTaxExpenseBenefitChangeInTaxMonetizationTransaction
Change in intangible drilling costs (9,706)ora_DeferredIncomeTaxExpenseBenefitChangeInIntangibleDrillingCosts 15,091ora_DeferredIncomeTaxExpenseBenefitChangeInIntangibleDrillingCosts 14,133ora_DeferredIncomeTaxExpenseBenefitChangeInIntangibleDrillingCosts
Benefit of production tax credits and alternative minimum tax credit 89ora_DeferredIncomeTaxExpenseBenefitProductionTaxCredits (949)ora_DeferredIncomeTaxExpenseBenefitProductionTaxCredits (10,515)ora_DeferredIncomeTaxExpenseBenefitProductionTaxCredits
$ 13,135ora_TotalDeferredIncomeTaxExpenseBenefit $ 10,458ora_TotalDeferredIncomeTaxExpenseBenefit $ (4,736)ora_TotalDeferredIncomeTaxExpenseBenefit