Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Cash flows from operating activities:
Net income	$ 47,872	$ 33,676
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	74,836	70,911
Amortization of premium from senior unsecured bonds	(230)	(231)
Accretion of asset retirement obligation	1,122	1,147
Stock-based compensation	4,308	4,548
Amortization of deferred lease income	(2,014)	(2,014)
Income attributable to sale of tax benefits, net of interest expense	(10,130)	(6,621)
Equity in losses of investees	1,210	149
Mark-to-market of derivative instruments	(4,467)	3,487
Write-off of unsuccessful exploration activities	8,107
Loss (gain) on severance pay fund asset	798	(399)
Gain on sale of a subsidiary and property, plant and equipment	(7,628)	(3,646)
Deferred income tax provision	13,071	14,235
Liability for unrecognized tax benefits	656	1,598
Deferred lease revenues	(188)	(167)
Other	(181)	(819)
Changes in operating assets and liabilities, net of amounts acquired:
Receivables	21,624	(23,181)
Costs and estimated earnings in excess of billings on uncompleted contracts	6,433	(26,588)
Inventories	4,952	273
Prepaid expenses and other	(5,163)	(6,175)
Deposits and other	279	4,296
Accounts payable and accrued expenses	(10,868)	(21,449)
Due from/to related entities, net	(64)	(69)
Billings in excess of costs and estimated earnings on uncompleted contracts	37,407	(12,700)
Liabilities for severance pay	(1,857)	1,068
Other long-term liabilities	(527)	959
Due from/to Parent	(588)	(62)
Net cash provided by operating activities	178,770	32,226
Cash flows from investing activities:
Short-term deposit		3,010
Net change in restricted cash and cash equivalents	(76,387)	(7,660)
Cash received from sale of a subsidiary and property, plant and equipment	35,250	7,699
Capital expenditures	(122,587)	(144,637)
Cash grant received from the U.S. Treasury under Section 1603 of the ARRA	27,427	14,685
Investment in unconsolidated companies	(631)	(2,467)
Increase in severance pay fund asset, net of payments made to retired employees	1,493	1,172
Net cash used in investing activities	(135,435)	(128,198)
Cash flows from financing activities:
Proceeds from long-term loans	140,000	45,000
Proceeds from exercise of options by employees	741	437
Proceeds from the sale of limited liability company interest in ORTP, LLC, net of transaction costs		31,376
Payment for acquisition of noncontrolling interest in Crump	(1,490)
Purchase of OFC Senior Secured Notes	(12,860)	(11,888)
Proceeds from revolving credit lines with banks	2,400,683	2,170,287
Repayment of revolving credit lines with banks	(2,484,600)	(2,120,605)
Repayments of long-term debt	(80,223)	(37,480)
Cash paid to non-controlling interest	(9,215)	(10,184)
Cash paid for interest rate cap	(1,505)
Cash received from non-controlling interest	2,234
Deferred debt issuance costs	(4,724)	(348)
Cash dividends paid	(7,279)	(1,816)
Net cash provided by (used in) financing activities	(58,238)	64,779
Net change in cash and cash equivalents	(14,903)	(31,193)
Cash and cash equivalents at beginning of period	57,354	66,628
Cash and cash equivalents at end of period	42,451	35,435
Supplemental non-cash investing and financing activities:
Increase (decrease) in accounts payable related to purchases of property, plant and equipment	(5,221)	7,744
Accrued liabilities related to financing activities		$ (1,347)