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Retirement Plans And Postretirement Benefits (Reconciliation Of Pension Plans' Benefit Obligations, Fair Value Of Assets Retirement Plans) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Changes in Plan Assets:      
Fair value of plan assets at beginning of period $ 126,812    
Fair value of plan assets at end of year 140,650 $ 126,812  
United States      
Changes in Benefit Obligation:      
Net benefit obligation at beginning of period 135,810 126,985  
Service cost 1,322 1,297 $ 1,315
Interest cost 3,949 5,070 4,709
Participant contributions 0 0  
Foreign currency exchange changes 0 0  
Actuarial (gain) loss 9,583 12,868  
Benefits paid 10,410 10,410  
Net benefit obligation at end of period 140,254 135,810 126,985
Changes in Plan Assets:      
Fair value of plan assets at beginning of period 107,832 99,845  
Actual return on plan assets 13,700 17,689  
Foreign currency exchange rate changes 0 0  
Employer contributions 4,446 708  
Participant contributions 0 0  
Benefits paid (10,410) (10,410)  
Fair value of plan assets at end of year 115,568 107,832 99,845
Funded status (underfunded): (24,686) (27,978)  
Non-current assets 0 0  
Current liabilities (423) (427)  
Non-current liabilities (24,263) (27,551)  
Net amount recognized (24,686) (27,978)  
Foreign [Member]      
Changes in Benefit Obligation:      
Net benefit obligation at beginning of period 28,903 22,332  
Service cost 1,183 624 674
Interest cost 174 275 253
Participant contributions 470 417  
Foreign currency exchange changes 2,869 379  
Actuarial (gain) loss 2,683 3,319  
Benefits paid 2,434 1,557  
Net benefit obligation at end of period 38,716 28,903 22,332
Changes in Plan Assets:      
Fair value of plan assets at beginning of period 18,980 15,354  
Actual return on plan assets 488 441  
Foreign currency exchange rate changes 1,893 377  
Employer contributions 817 834  
Participant contributions 470 417  
Benefits paid (2,434) (1,557)  
Fair value of plan assets at end of year 25,082 18,980 $ 15,354
Funded status (underfunded): (13,634) (9,923)  
Non-current assets 13 37  
Current liabilities (50) (43)  
Non-current liabilities (13,597) (9,917)  
Net amount recognized $ (13,634) $ (9,923)