Investments In Affiliated Companies, Partnership And Other Companies [Line Items]

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Joint Venture, Ownership Percentage

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Noncontrolling Interest, Ownership Interest Sold

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Amount of gain (loss) from deconsolidation of subsidiary and derecognition of group of assets constituting transfer of business or nonprofit activity, excluding conveyance of oil and gas mineral rights and transfer of good or service in contract with customer.

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This item represents an other than temporary decline in value that has been recognized against an investment accounted for under the equity method of accounting. The excess of the carrying amount over the fair value of the investment represents the amount of the write down which is or was reflected in earnings. The written down value is a new cost basis with the adjusted value of the investment becoming its new carrying value subject to the equity accounting method. Evidence of a loss in value might include, but would not necessarily be limited to, absence of an ability to recover the carrying amount of the investment or inability of the investee to sustain an earnings capacity which would justify the carrying amount of the investment.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized.

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Amount of income (loss) for proportionate share of equity method investee's income (loss).

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Value of the investment at close of period. For investment in and advances to affiliates, if operations of any controlled companies are different in character from those of the company, group such affiliates within divisions and by type of activities.

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The parent entity's interest in net assets of the subsidiary, expressed as a percentage.

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The cash outflow associated with the purchase of noncontrolling interest during the period.

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The cash outflow associated with the purchase of all investments (debt, security, other) during the period.

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Dividends received on equity and other investments during the current period.

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Investments In Affiliated Companies, Partnership And Other Companies (Investments In Companies Accounted For Under The Equity Method) (Details) € in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2020 USD ($)	Dec. 31, 2020 EUR (€)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]
Income (Loss) from Equity Method Investments		$ 12,604		$ 1,774	$ (2,222)
Investments in and Advances to Affiliates, at Fair Value		42,963		59,980
Equity method investments		141,375		141,594
Impairment on affiliated company		4,400		3,700	17,500
Equity Method Investments, additional investment through convertible bonds		8,212		8,567	7,538
Deconsolidation, Gain (Loss), Amount					41,891
Subsidiary A
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]
Income (Loss) from Equity Method Investments		10,610		8,497	11,340
Equity method investments		$ 83,150		77,298
Equity method investment ownership percentage		50.00%
Proceeds from Dividends Received		$ 4,750		4,200
Rafael Advanced Defense Systems Ltd
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]
Equity method investment ownership percentage		50.00%
Subsidiary B
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]
Income (Loss) from Equity Method Investments		$ 435		(317)	(2,077)
Equity method investments		$ 19,749		19,314
Equity method investment ownership percentage		50.00001%
Subsidiary Of Rafael
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]
Equity method investment ownership percentage		49.99999%
Subsidiary C
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]
Income (Loss) from Equity Method Investments		$ 4,765		3,840	10,102
Equity method investments		20,873
Proceeds from Dividends Received		6,100
Subsidiary F
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]
Investments in and Advances to Affiliates, at Fair Value		12,939		39,658
Equity method investments				23,940
Company G
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]
Investments in and Advances to Affiliates, at Fair Value		$ 7,764		7,162
Ownership interest acquired by noncontrolling interest		41.00%	41.00%
Subsidiary D
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]
Income (Loss) from Equity Method Investments		$ (837)		(3,696)	(6,275)
Equity method investments		$ 4,191		5,028
Subsidiary D \| Company D
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]
Ownership percentage in subsidiaries		33.00%
Subsidiary E
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]
Income (Loss) from Equity Method Investments		$ 0		(3,466)	(9,737)
Equity method investments		$ 0		4,800
Ownership interest acquired by noncontrolling interest		3.00%	3.00%
Impairment on affiliated company		$ 4,400
Subsidiary E \| Company E
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]
Ownership percentage in subsidiaries		77.00%
Others
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]
Income (Loss) from Equity Method Investments		$ (2,369)		(3,084)	$ (5,575)
Equity method investments		13,412		11,214
Company H
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]
Investments in and Advances to Affiliates, at Fair Value		$ 4,595		$ 4,595
Company H \| Company H
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]
Ownership percentage in subsidiaries		35.00%
Company I \| Company H
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]
Ownership percentage in subsidiaries		8.00%
Strategic Investor \| Subsidiary E
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]
Payments to Acquire Additional Interest in Subsidiaries		$ 2,800	€ 2,500
Wholly-Owned U.K Subsidiary \| Corporate Joint Venture \| Subsidiary C
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]
Joint Venture, Ownership Percentage	50.00%
Kellogg Brown & Root Limited \| Corporate Joint Venture \| Subsidiary C
Investments In Affiliated Companies, Partnership And Other Companies [Line Items]
Joint Venture, Ownership Percentage	50.00%