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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Schedule of Changes In Accumulated Other Comprehensive Income By Components
The following table displays the changes in accumulated other comprehensive income (loss), net of taxes, in the amount of $66,259, $50,019 and $7,292, for the years ended December 31, 2020, 2019 and 2018, respectively, by components:

Unrealized gains (losses) on derivative instrumentsUnrealized gains (losses) on available-for-sale marketable securitiesUnrealized gains (losses) with respect to pension and post-retirement benefit plansForeign currency translation differencesTotal
Balance as of January 1, 2018$(6,963)$11 $(47,469)$(33,231)$(87,652)
Other comprehensive income (loss)
before reclassifications		(5,357)— 3,321 (19,056)(21,092)
Amount reclassified from accumulated other comprehensive income (loss)9,162 (11)4,649 — 13,800 
Net current-period other comprehensive income (loss)3,805 (11)7,970 (19,056)(7,292)
 
Balance as of January 1, 2019$(3,158)$— $(39,499)$(52,287)$(94,944)
Other comprehensive income (loss)
before reclassifications		19,838 — (60,161)6,822 (33,501)
Amount reclassified from accumulated other comprehensive income (loss)(9,873)— (6,645)— (16,518)
Net current-period other comprehensive income (loss)9,965 — (66,806)6,822 (50,019)
Balance as of January 1, 2020$6,807 $— $(106,305)$(45,465)$(144,963)
Other comprehensive income (loss) before reclassifications$11,798 $— $(57,359)$2,014 $(43,547)
Amount reclassified from accumulated other comprehensive income (loss)(39,280)— 16,568 — (22,712)
Net current-period other comprehensive income (loss)(27,482)— (40,791)2,014 (66,259)
Balance as of December 31, 2020$(20,675)$— $(147,096)$(43,451)$(211,222)
Schedule Of Estimated Useful Life Of Assets
Depreciation is calculated by the straight-line method over the estimated useful life of the assets at the following annual rates:
 % 
Buildings and leasehold improvements (*)
2%-20% 
Instruments, machinery and equipment10%-33% 
Office furniture and other7%-15% 
Motor vehicles and airplanes15%-20%(Mainly 15%)
(*)    Leasehold improvements are amortized generally over the term of the lease or the useful life of the assets, whichever is shorter.
Income Statement Impact of Cumulative Catch-Up Adjustments
The aggregate cumulative catch-up adjustment in EAC estimates on significant contracts had the following favorable/ (unfavorable) impact on the Company's operating results:
Year ended December 31,
202020192018
Cost of revenues, net$(45,700)$4,600 $32,200 
Percentage of cost of revenues(*)
(1.33)%0.14 %1.19 %
Net income$(39,400)$4,200 $28,600 
Diluted earning per share$(0.89)$0.10 $0.67 

(*)     Percentage of cost of revenues during 2020 is excludes impairment of assets related to the COVID-19 impact (see Note 1C). During 2019 and 2018 it excluded non-recurring acquisition related expenses recorded in cost of revenues.
Schedule of Disaggregation of Revenue
Disaggregation of revenue:

Revenue by products and services was as follows:
Year ended December 31,
20202019
Revenue from sale of products$4,312,010 $4,146,618 
Service revenue350,562 361,782 
$4,662,572 $4,508,400 

Revenue by transfer type was as follows:
Year ended December 31,
20202019
Over time$3,243,785 $3,432,511 
Point in time1,418,787 1,075,889 
$4,662,572 $4,508,400 
Note 2 - SIGNIFICANT ACCOUNTING POLICIES (Cont.)

T.    REVENUE RECOGNITION (Cont.)

Revenue by customers was as follows:
Year ended December 31,
20202019
Israel Government Authorities (1,2)
$1,081,609 $1,134,703 
US Government (2)
1,030,313 800,345 
Other Governments2,107,730 2,121,164 
Commercial sales and other442,920 452,188 
$4,662,572 $4,508,400 
(1) Including U.S. Foreign Military Financing sales
(2) Including indirect sales
Schedule Of Warranty Liability
Changes in the Company’s provision for warranty, which is included mainly in other payables and accrued expenses in the balance sheet, are as follows:
 20202019
Balance, at January 1$181,323 $219,695 
Warranties issued during the year114,730 58,298 
Reduction due to expired warranties or claims during the year(71,698)(98,224)
Additions resulting from acquisitions— 1,554 
Balance, at December 31$224,355 $181,323 
Schedule Of Assets And Liabilities Measured At Fair Value On Recurring Basis
Assets and liabilities measured at fair value on a recurring basis are summarized below:
 Fair value measurement at
December 31, 2020 using
 Quoted Prices
in Active
Markets for
Identical Assets
 (Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Description of Assets   
Foreign currency derivatives and option contracts$— $14,676 $— 
Cross-currency interest rate swap— 16,851 — 
Premises evacuation — — 29,133 
Investments elected to be accounted for using the fair value method— — 37,963 
Liabilities
Contingent purchase obligation— — (141,178)
Foreign currency derivative and option contracts— (22,579)— 
Total$— $8,948 $(74,082)


 Fair value measurement at
December 31, 2019 using
 Quoted Prices
in Active
Markets for
Identical Assets
 (Level 1)		Significant
Other
Observable
Inputs
(Level 2)		Significant
Unobservable
Inputs
(Level 3)
Description of Assets   
Foreign currency derivatives and option contracts$— $23,886 $— 
Cross-currency interest rate swap— 6,183 — 
Premises evacuation— — 30,867 
Investments elected to be accounted for using the fair value method— — 51,415 
Liabilities
Contingent purchase obligation— — (147,086)
Foreign currency derivative and option contracts— (8,326)— 
Total$— $21,743 $(64,804)
Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions The fair value based cost of employee stock options is estimated at the grant date using a lattice-based option valuation model. During the two years ended December 31, 2020 there were no option grants to the Company's employees and non-employees.
Accounting Standards Update and Change in Accounting Principle
The changes in the allowance for credit losses related to accounts receivable for the year ended December 31, 2020 were as follows:
2020
Balance as of January 1,$10,557 
Current period provision for expected credit losses2,149 
Write-offs charged against the allowance for expected credit losses(1,998)
Cumulative effect related to the adoption of ASC3265,484 
Balance as of December 31,$5,494,708