Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012
Cash flows from operating activities:
Net income	$ 33,676	$ 16,232
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	70,911	75,812
Amortization of premium from senior unsecured bonds	(231)	(231)
Accretion of asset retirement obligation	1,147	1,264
Stock-based compensation	4,548	4,837
Amortization of deferred lease income	(2,014)	(2,014)
Income attributable to sale of tax benefits, net of interest expense	(6,621)	(2,775)
Equity in losses of investees	149	442
Mark-to-market of derivative instruments	3,487
Write-off of unconsolidated investment		1,100
Write-off of unsuccessful exploration activities		1,919
Impairment charge		7,264
Loss (gain) on severance pay fund asset	(399)	332
Gain on sale of a subsidiary	(3,646)
Deferred income tax provision	14,235	5,894
Liability for unrecognized tax benefits	1,598	1,264
Deferred lease revenues	(167)	110
Other	(819)
Changes in operating assets and liabilities:
Receivables	(23,181)	(29,742)
Costs and estimated earnings in excess of billings on uncompleted contracts	(26,588)	(3,738)
Inventories	273	(5,245)
Prepaid expenses and other	(6,175)	(12,825)
Deposits and other	4,296	(5,356)
Accounts payable and accrued expenses	(21,449)	9,523
Due from/to related entities, net	(69)	(64)
Billings in excess of costs and estimated earnings on uncompleted contracts	(12,700)	(558)
Liabilities for severance pay	1,068	271
Other long-term liabilities	959	(1,396)
Due from/to Parent	(62)	64
Net cash provided by operating activities	32,226	62,384
Cash flows from investing activities:
Marketable securities, net		18,763
Short-term deposit	3,010	(3,008)
Net change in restricted cash, cash equivalents and marketable securities	(7,660)	(775)
Cash received from sale of a subsidiary	7,699
Capital expenditures	(144,637)	(186,332)
Cash grant received	14,685	119,199
Investment in unconsolidated companies	(2,467)	(1,260)
Increase (decrease) in severance pay fund asset, net of payments made to retired employees	1,172	(198)
Net cash used in investing activities	(128,198)	(53,611)
Cash flows from financing activities:
Proceeds from issuance of senior unsecured bonds		1,171
Proceeds from long-term loans	45,000
Proceeds from exercise of options by employees	437
Proceeds from the sale of limited liability company interest in ORTP, LLC, net of transaction costs	31,376
Purchase of OFC Senior Secured Notes	(11,888)
Proceeds from revolving credit lines with banks	2,170,287	2,134,887
Repayment of revolving credit lines with banks	(2,120,605)	(2,161,462)
Repayments of long-term debt	(37,480)	(28,927)
Cash paid to non-controlling interest	(10,184)	(10,991)
Deferred debt issuance costs	(348)	(2,177)
Cash dividends paid	(1,816)	(3,636)
Net cash provided by (used in) financing activities	64,779	(71,135)
Net change in cash and cash equivalents	(31,193)	(62,362)
Cash and cash equivalents at beginning of period	66,628	99,886
Cash and cash equivalents at end of period	35,435	37,524
Supplemental non-cash investing and financing activities:
Increase (decrease) in accounts payable related to purchases of property, plant and equipment	7,744	(18,119)
Accrued liabilities related to financing activities	$ (1,347)