Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash flows from operating activities:
Net income (loss)	$ 55,015us-gaap_ProfitLoss	$ 42,031us-gaap_ProfitLoss	$ (212,607)us-gaap_ProfitLoss
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation and amortization	100,798us-gaap_DepreciationAndAmortization	92,932us-gaap_DepreciationAndAmortization	102,340us-gaap_DepreciationAndAmortization
Amortization of premium from senior unsecured bonds	(308)	(307)	(307)
Accretion of asset retirement obligation	829	1,544	1,701
Stock-based compensation	5,571us-gaap_ShareBasedCompensation	6,262us-gaap_ShareBasedCompensation	6,394us-gaap_ShareBasedCompensation
Amortization of deferred lease income	(2,685)us-gaap_RecognitionOfDeferredRevenue	(2,685)us-gaap_RecognitionOfDeferredRevenue	(2,685)us-gaap_RecognitionOfDeferredRevenue
Income attributable to sale of tax benefits, net of interest expense	(13,823)	(7,999)	(4,003)
Equity in income (losses) of investees	3,213	150	442
Mark-to-market of derivative instruments	(6,960)us-gaap_UnrealizedGainLossOnDerivatives	7,813us-gaap_UnrealizedGainLossOnDerivatives
Write-off of unconsolidated investment			2,114ora_WriteOffOfUnconsolidatedInvestment
Write-off of unsuccessful exploration activities	15,439	4,094	2,639
Impairment charge			236,377us-gaap_AssetImpairmentCharges
Gain on severance pay fund asset	1,492us-gaap_GainLossOnSaleOfOtherAssets	(877)us-gaap_GainLossOnSaleOfOtherAssets	(931)us-gaap_GainLossOnSaleOfOtherAssets
Gain on sale of a subsidiary and property, plant and equipment	(7,628)	(3,646)
Deferred income tax provision (benefit)	13,135us-gaap_DeferredIncomeTaxExpenseBenefit	9,245us-gaap_DeferredIncomeTaxExpenseBenefit	(4,736)us-gaap_DeferredIncomeTaxExpenseBenefit
Liability for unrecognized tax benefits	2,561	(2,330)	1,405
Deferred lease revenues	(251)	(217)	128
Other	(181)us-gaap_OtherNoncashIncomeExpense	(819)us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities, net of amounts acquired:
Receivables	47,114us-gaap_IncreaseDecreaseInReceivables	(37,174)us-gaap_IncreaseDecreaseInReceivables	(3,623)us-gaap_IncreaseDecreaseInReceivables
Costs and estimated earnings in excess of billings on uncompleted contracts	(6,576)	(11,604)	(5,647)
Inventories	5,359us-gaap_IncreaseDecreaseInInventories	(1,620)us-gaap_IncreaseDecreaseInInventories	(8,128)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other	(1,337)	(600)	(15,472)
Deposits and other	584	621	(12,746)
Accounts payable and accrued expenses	(9,638)	6,077	11,414
Due from/to related entities, net	(9)	(69)	(86)
Billings in excess of costs and estimated earnings on uncompleted contracts	16,821	(17,505)	(7,696)
Liabilities for severance pay	(3,442)	1,267	2,340
Other long-term liabilities	(903)	2,302	895
Due from/to Parent	(955)	(71)	(51)
Net cash provided by operating activities	213,235	86,760	89,471
Cash flows from investing activities:
Marketable securities, net			18,763
Short-term deposit		3,010	(3,010)
Net change in restricted cash, cash equivalents and marketable securities	(42,183)	25,472	(1,016)
Cash received from sale of a subsidiary	35,250	7,699
Capital expenditures	(151,153)	(204,628)	(233,020)
Cash grant received from the U.S. Treasury under Section 1603 of the ARRA	27,427us-gaap_ProceedsFromGrantors	14,685us-gaap_ProceedsFromGrantors	119,199us-gaap_ProceedsFromGrantors
Investment in unconsolidated companies	(631)	(4,635)	(1,390)
Increase (decrease) in severance pay fund asset, net of payments made to retired employees	2,128	1,244	(316)
Net cash used in investing activities	(129,162)	(157,153)	(100,790)
Cash flows from financing activities:
Proceeds from issuance of senior unsecured bonds			1,171
Proceeds from long-term loans, net of transaction costs	140,000	90,000	214,051
Proceeds from exercise of options by employees	981	529
Proceeds from the sale of limited liability company interest in ORTP LLC, net of transaction costs		31,376
Purchase of OFC Senior Secured Notes	(12,860)us-gaap_PaymentsOfDebtIssuanceCosts	(11,888)us-gaap_PaymentsOfDebtIssuanceCosts
Proceeds from revolving credit lines with banks	2,830,683	3,058,956	2,953,535
Repayment of revolving credit lines with banks	(2,922,400)	(3,020,545)	(3,093,978)
Cash received from non-controlling interest	2,234
Payment for acquisition of noncontrolling interest in Crump	(1,490)
Repayments of long-term debt	(111,180)us-gaap_RepaymentsOfLongTermDebt	(68,370)us-gaap_RepaymentsOfLongTermDebt	(74,502)us-gaap_RepaymentsOfLongTermDebt
Cash paid to non-controlling interest	(11,320)us-gaap_PaymentsToMinorityShareholders	(13,384)us-gaap_PaymentsToMinorityShareholders	(15,383)us-gaap_PaymentsToMinorityShareholders
Cash paid for interest rate cap	(1,505)
Deferred debt issuance costs	(4,785)us-gaap_PaymentsOfFinancingCosts	(1,919)us-gaap_PaymentsOfFinancingCosts	(3,197)us-gaap_PaymentsOfFinancingCosts
Cash dividends paid	(9,555)us-gaap_PaymentsOfDividendsCommonStock	(3,636)us-gaap_PaymentsOfDividendsCommonStock	(3,636)us-gaap_PaymentsOfDividendsCommonStock
Net cash provided by (used in) financing activities	(101,197)	61,119	(21,939)
Net change in cash and cash equivalents	(17,124)	(9,274)	(33,258)
Cash and cash equivalents at beginning of period	57,354	66,628	99,886
Cash and cash equivalents at end of period	40,230	57,354	66,628
Cash paid during the year for:
Interest, net of interest capitalized	62,376us-gaap_InterestPaidNet	51,306us-gaap_InterestPaidNet	40,398us-gaap_InterestPaidNet
Income taxes, net	5,787us-gaap_IncomeTaxesPaidNet	4,114us-gaap_IncomeTaxesPaidNet	11,570us-gaap_IncomeTaxesPaidNet
Supplemental non-cash investing and financing activities:
Increase (decrease) in accounts payable related to purchases of property, plant and equipment	3,853	4,372	(18,813)
Accrued liabilities related to financing activities	658us-gaap_LiabilitiesAssumed1		288us-gaap_LiabilitiesAssumed1
Increase (decrease) in asset retirement cost and asset retirement obligation	$ (366)	$ 588	$ (3,696)

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The increase (decrease) during the reporting period in the value of prepaid expenses and other assets not separately disclosed in the statement of cash flows, for example, deferred expenses, intangible assets, or income taxes.

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The increase (decrease) during the reporting period in the total amount due within one year (or one operating cycle) from all parties, associated with underlying transactions that are classified as operating activities.

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The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.

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The increase (decrease) during the period in the carrying amount (including both current and noncurrent portions of the accrual) of the liability pertaining to the exit from or disposal of business activities or restructuring pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination and to asset retirement obligations.

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The increase (decrease) during the reporting period of the amount of revenue for work performed for which billing has not occurred, net of uncollectible accounts.

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The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.

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The fair value of liabilities assumed in noncash investing or financing activities.

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Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.

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Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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Other income (expense) included in net income that results in no cash inflows or outflows in the period. Includes noncash adjustments to reconcile net income (loss) to cash provided by (used in) operating activities that are not separately disclosed.

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Other cash or noncash adjustments to reconcile net income to cash provided by (used in) operating activities that are not separately disclosed in the statement of cash flows (for example, cash received or cash paid during the current period for miscellaneous operating activities, net change during the reporting period in other assets or other liabilities).

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The cash outflow for derivative instruments during the period, which are classified as financing activities, excluding those designated as hedging instruments.

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The net cash paid (received) associated with the acquisition or disposal of all investments, including securities and other assets.

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Net cash outflow or inflow from other deposits that are not separately disclosed.

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The net cash outflow or inflow from purchases, sales and disposals of property, plant and equipment and other productive assets, including intangibles.

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The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.

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Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.

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The cash outflow for loan and debt issuance costs.

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The cash outflow associated with the purchase of or advances to an equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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The cash outflow associated with the acquisition of or advances to an entity that is related to it but not strictly controlled (for example, an unconsolidated subsidiary, affiliate, and joint venture or equity method investment) or the acquisition of an additional interest in a subsidiary (controlled entity).

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Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

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Cash received from grantors during the current period related to operating activities. This element represents receipts from a guarantor for the amount of guarantee provided.

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The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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The cash inflow from the issuance of long-term debt that is not secured by collateral. Excludes proceeds from tax exempt unsecured debt.

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The cash inflow from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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Amount of cash inflow from a noncontrolling interest. Includes, but is not limited to, purchase of additional shares or other increase in noncontrolling interest ownership.

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The proceeds from the sale of an interest in a unit of partnership.

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The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

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The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

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The amount of previously reported deferred or unearned revenue that was recognized as revenue during the period. For cash flows, this element primarily pertains to amortization of deferred credits on long-term arrangements. As a noncash item, it is deducted from net income when calculating cash provided by or used in operations using the indirect method.

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

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The cash outflow for the settlement of obligation drawn from a contractual arrangement with the lender, including letter of credit, standby letter of credit and revolving credit arrangements, under which borrowings can be made up to a specific amount at any point in time with maturities due beyond one year or the operating cycle, if longer.

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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The net change in the difference between the fair value and the carrying value, or in the comparative fair values, of derivative instruments, including options, swaps, futures, and forward contracts, held at each balance sheet date, that was included in earnings for the period.

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The net amount of all increases and decreases in unrecognized tax benefits for the period.

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