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Employee Benefit Plans (Net Periodic Benefit Cost For U.S. Employees) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Defined Benefit Pension Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost $ 9,522,000 $ 8,255,000 $ 9,801,000
Interest cost 10,112,000 11,712,000 10,290,000
Prior service credit recognition 0    
Expected return on assets (20,781,000) (17,968,000) (17,202,000)
Amortization of actuarial loss from earlier periods 8,551,000 7,635,000 6,839,000
FAS 88 settlement charge 1,025,000 408,000
Net periodic benefit cost 8,429,000 10,042,000 9,728,000
Other comprehensive income (loss) attributable to change from prior year (5,486,000) 8,885,000  
Total recognized in net periodic benefit cost and other comprehensive income (loss) 2,943,000 18,927,000  
Post-Retirement Plan [Member]      
Defined Benefit Plan Disclosure [Line Items]      
Service cost 1,066,000 983,000 1,312,000
Interest cost 845,000 980,000 999,000
Prior service credit recognition (577,000) (577,000) (577,000)
Expected return on assets (155,000) 94,000
Net periodic benefit cost 1,334,000 1,231,000 $ 1,829,000
Other comprehensive income (loss) attributable to change from prior year 4,619,000 150,000  
Total recognized in net periodic benefit cost and other comprehensive income (loss) $ 5,953,000 $ 1,381,000