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Benefit Plans And Obligations For Termination Indemnity (Tables)
 12 Months Ended
Dec. 31, 2020
Defined Benefit Plan Disclosure [Line Items]  
Plans' Funded Status And Amounts Recognized In The Consolidated Financial Statements
The following table sets forth the Plans’ funded status and amounts recognized in the consolidated financial statements for the years ended December 31, 2020 and 2019:
 December 31,
 20202019
Changes in benefit obligation:  
Benefit obligation at beginning of year$831,111 $628,424 
Benefit obligation related to acquired companies— 111,654 
Service cost13,035 18,305 
Interest cost16,626 19,723 
Exchange rate differences25,623 29,778 
Amendments3,670 3,689 
Actuarial loss73,941 90,847 
Benefits paid(38,263)(75,684)
Other adjustments— 4,375 
Benefit obligation at end of year$925,743 $831,111 
Changes in the Plans’ assets:  
Fair value of Plans’ assets at beginning of year289,493 164,282 
Benefit assets related to acquired companies— 91,724 
Actual return on Plans’ assets (net of expenses)39,131 37,901 
Employer contribution2,829 3,716 
Benefits paid(12,291)(8,130)
Fair value of Plans’ assets at end of year$319,162 $289,493 
Accrued benefit cost, end of year:  
Funded status(606,583)(541,623)
Unrecognized net actuarial loss167,019 123,736 
Unrecognized prior service cost— 8 
 $(439,564)$(417,879)
Amount recognized in the statement of financial position:  
Accrued benefit liability, current(25,532)(37,158)
Accrued benefit liability, non-current(581,051)(504,465)
Accumulated other comprehensive income, pre-tax167,019 123,744 
Net amount recognized$(439,564)$(417,879)
Components Of Net Periodic Pension Cost
 Year ended December 31,
 202020192018
Components of the Plans’ net periodic pension cost:   
Service cost$13,035 $18,305 $8,391 
Interest cost16,626 19,723 96,310 
Expected return on  Plans’ assets(20,302)(13,507)(12,080)
Amortization of prior service cost218 16 64 
Amortization of net actuarial loss17,742 4,809 5,884 
Total net periodic benefit cost$27,319 $29,346 $98,569 
Additional information   
Accumulated benefit obligation$865,273 $781,749 $628,017 
Weighted Average Assumptions
 December 31,
 20202019
Weighted average assumptions:  
Discount rate as of December 311.5 %1.9 %
Expected long-term rate of return on Plans’ assets6.8 %7.2 %
Rate of compensation increase1.6 %0.6 %
Asset Allocation By Category
Asset allocation by category as of December 31:
 20202019
Asset Category:  
Equity Securities65.3 %67.2 %
Debt Securities31.7 %32.1 %
Other3.0 %0.7 %
Total100.0 %100.0 %
Target Asset Allocation For The Plan
The investment policy of ESA is directed toward a broad range of securities. The diversified portfolio seeks to maximize investment return while minimizing the risk levels associated with investing. The investment policy is structured to consider the Plans' obligations and the expected timing of benefit payments. The target asset allocation for the Plans' years presented is as follows:
 20202019
Asset Category:  
Equity Securities65.0 %63.0 %
Debt Securities35.0 %36.0 %
Other— %1.0 %
Total100.0 %100.0 %
Fair Value Of The Asset Values By Category
The fair value of the asset values by category at December 31, 2020, was as follows:
  Quoted Prices in Active Markets for Identical AssetsSignificant Observable InputsSignificant Unobservable Inputs
Total(Level 1)(Level 2)(Level 3)
Asset Category
Cash$3,329 $3,329 $— $— 
Cash Equivalents:    
Money Market Funds (a)6,181 6,181 — — 
Fixed Income Securities:    
Mutual Funds (b)101,167 101,167 — — 
Equity Securities:    
International Companies (c)5,092 5,092 — — 
Mutual Funds (d)203,393 203,393 — — 
Total$319,162 $319,162 $— $— 

a.This category includes highly liquid daily traded cash-like vehicles.
b.This category invests in highly liquid mutual funds representing a diverse offering of debt issuance.
c.This category represents common stocks of companies domiciled outside of the U.S.; they can be represented by ordinary shares or ADRs.
d.This category represents highly liquid diverse equity mutual funds of varying asset classes and styles.
Effect Of A 1% Change In The Health Care Cost Trend Rate
The effect of a 1% change in the health care cost trend rate at December 31, 2020 was as follows:
 1% increase1% decrease
Net periodic benefit cost$20 $17 
Benefit obligation$134 $118 
Retiree Medical Plan  
Defined Benefit Plan Disclosure [Line Items]  
Plans' Funded Status And Amounts Recognized In The Consolidated Financial Statements The measurement date for ESA's benefit obligation is December 31. The following table sets forth the retiree medical plans’ funded status and amounts recognized in the consolidated financial statements for the years ended December 31, 2020 and 2019:
 December 31,
 20202019
Change in Benefit Obligation:  
Benefit obligation at beginning of period$1,413 $1,359 
Service cost106 81 
Interest cost39 51 
Actuarial (gain) loss44 (34)
Employee contribution10 17 
Benefits paid(40)(61)
Benefit obligation at end of period$1,572 $1,413 
Change in Plan Assets:  
Employer contribution$30 $45 
Employee contribution10 16 
Benefits paid(40)(61)
Fair value of Plan assets at end of period$— $— 

 Year ended December 31,
 20202019
Accrued benefit cost, end of period:  
Funded status$(1,571)$(1,412)
Unrecognized net actuarial (gain) loss(1,290)(1,479)
Accrued benefit cost, end of period$(2,861)$(2,891)
Amounts recognized in the statement of financial position:  
Accrued benefit liability, current$(82)$(86)
Accrued benefit liability, non-current(1,489)(1,326)
Accumulated other comprehensive gain, pretax(1,290)(1,479)
Net amount recognized$(2,861)$(2,891)

Components of net periodic pension cost (for period):  
Service cost$106 $81 
Interest cost39 51 
Amortization of net actuarial gain(145)(165)
Total net periodic benefit cost$— $(33)

Assumptions as of end of period: 
Discount rate1.97 %2.84 %
Health care cost trend rate assumed for next year5.50 %5.50 %
Ultimate health care cost trend rate4.04 %3.84 %