Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013
Cash flows from operating activities:
Net income	$ 31,102	$ 20,533
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	48,819	45,884
Amortization of premium from senior unsecured bonds	(153)	(153)
Accretion of asset retirement obligation	743	758
Stock-based compensation	2,806	2,857
Amortization of deferred lease income	(1,343)	(1,343)
Income attributable to sale of tax benefits, net of interest expense	(7,540)	(4,578)
Equity in (income) losses of investees	311	(9)
Mark-to-market of derivative instruments	(302)	2,370
Write-off of unsuccessful exploration activities	8,107
Loss on severance pay fund asset	(396)	(403)
Gain on sale of a subsidiary and property, plant and equipment	(7,628)	(3,646)
Deferred income tax provision	8,887	9,634
Liability for unrecognized tax benefits	639	1,074
Deferred lease revenues	(124)	(117)
Other	(181)	(819)
Changes in operating assets and liabilities, net of amounts acquired:
Receivables	19,959	(17,748)
Costs and estimated earnings in excess of billings on uncompleted contracts	(4,701)	(6,710)
Inventories	3,997	2,763
Prepaid expenses and other	(8,738)	(4,173)
Deposits and other	86	(2,840)
Accounts payable and accrued expenses	(11,094)	(8,827)
Due from/to related entities, net		(46)
Billings in excess of costs and estimated earnings on uncompleted contracts	20,282	(14,438)
Liabilities for severance pay	(47)	309
Other long-term liabilities	313	(225)
Due from/to Parent	(225)	(157)
Net cash provided by operating activities	103,579	19,950
Cash flows from investing activities:
Short-term deposit		(11)
Net change in restricted cash and cash equivalents	(3,012)	(8,975)
Cash received from sale of a subsidiary and property, plant and equipment	35,250	7,699
Capital expenditures	(89,125)	(102,019)
Cash grant received from the U.S. Treasury under Section 1603 of the ARRA	27,427
Investment in unconsolidated companies	(631)	(924)
Increase in severance pay fund asset, net of payments made to retired employees	1,079	1,061
Net cash used in investing activities	(29,012)	(103,169)
Cash flows from financing activities:
Proceeds from long-term loans		45,000
Proceeds from exercise of options by employees	392
Proceeds from the sale of limited liability company interest in ORTP, LLC, net of transaction costs		31,508
Purchase of OFC Senior Secured Notes	(12,860)	(11,888)
Proceeds from revolving credit lines with banks	1,742,383	1,354,761
Repayment of revolving credit lines with banks	(1,729,800)	(1,348,120)
Repayments of long-term debt	(41,078)	(18,787)
Cash paid to non-controlling interest	(5,398)	(6,990)
Cash received from non-controlling interest	2,234
Deferred debt issuance costs	(2,671)
Cash dividends paid	(5,003)
Net cash provided by (used in) financing activities	(51,801)	45,484
Net change in cash and cash equivalents	22,766	(37,735)
Cash and cash equivalents at beginning of period	57,354	66,628
Cash and cash equivalents at end of period	80,120	28,893
Supplemental non-cash investing and financing activities:
Increase (decrease) in accounts payable related to purchases of property, plant and equipment	(7,289)	4,063
Accrued liabilities related to financing activities		$ (1,347)