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Pension Plans and Other Postretirement Benefits (Changes In The Plans' Benefit Obligations And Assets) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Amounts recognized in the Consolidated Balance Sheets      
Noncurrent assets $ 137,069 $ 133,848  
Pension Benefits | United States      
Change in benefit obligation      
Benefit obligation at beginning of year 403,056 349,212  
Service cost 16,544 13,471 $ 15,391
Interest cost 13,771 14,509 13,256
Actuarial net (gain) loss 37,978 38,045  
Plan amendment 65 1,014  
Benefits paid (13,693) (13,195)  
Benefit obligation at end of year 457,721 403,056 349,212
Change in plan assets      
Fair value of plan assets at beginning of year 483,823 384,552  
Actual return on plan assets 80,137 109,493  
Employer contributions 2,904 2,973  
Benefits paid (13,693) (13,195)  
Fair value of plan assets at end of year 553,171 483,823 384,552
Funded status 95,450 80,767  
Amounts recognized in the Consolidated Balance Sheets      
Noncurrent assets 136,530 121,968  
Current liabilities (2,849) (2,920)  
Noncurrent liabilities (38,231) (38,281)  
Amounts recognized in the Consolidated Balance Sheets 95,450 80,767  
Amounts recognized in accumulated other comprehensive loss      
Actuarial net (gain) loss 63,654 73,261  
Prior service cost (credit) 636 842  
Amounts recognized in accumulated other comprehensive loss 64,290 74,103  
Pension Benefits | Foreign Retirement Plans      
Change in benefit obligation      
Benefit obligation at beginning of year 206,058 173,620  
Service cost 8,544 6,430 7,271
Interest cost 3,866 4,768 4,514
Employee contributions 714 680  
Actuarial net (gain) loss 36,463 21,558  
Benefits paid (5,059) (5,977)  
Foreign currency translation 12,003 4,979  
Benefit obligation at end of year 262,589 206,058 173,620
Change in plan assets      
Fair value of plan assets at beginning of year 189,455 163,746  
Actual return on plan assets 13,590 19,591  
Employer contributions 5,913 5,586  
Employee contributions 714 680  
Benefits paid (5,059) (5,977)  
Foreign currency translation 8,004 5,829  
Fair value of plan assets at end of year 212,617 189,455 163,746
Funded status (49,972) (16,603)  
Amounts recognized in the Consolidated Balance Sheets      
Noncurrent assets 539 11,880  
Current liabilities (407) (297)  
Noncurrent liabilities (50,104) (28,186)  
Amounts recognized in the Consolidated Balance Sheets (49,972) (16,603)  
Amounts recognized in accumulated other comprehensive loss      
Actuarial net (gain) loss 85,298 52,902  
Prior service cost (credit) 821 778  
Amounts recognized in accumulated other comprehensive loss 86,119 53,680  
Postretirement Benefits | United States      
Change in benefit obligation      
Benefit obligation at beginning of year 40,320 37,512  
Service cost 912 718 896
Interest cost 1,340 1,514 1,458
Actuarial net (gain) loss 2,221 3,165  
Plan amendment 0 0  
Benefits paid (3,086) (2,589)  
Benefit obligation at end of year 41,707 40,320 37,512
Change in plan assets      
Fair value of plan assets at beginning of year 22,092 22,378  
Actual return on plan assets 750 1,063  
Employer contributions 1,616 1,240  
Benefits paid (3,086) (2,589)  
Fair value of plan assets at end of year 21,372 22,092 $ 22,378
Funded status (20,335) (18,228)  
Amounts recognized in the Consolidated Balance Sheets      
Noncurrent assets 0 0  
Current liabilities (1,074) (1,164)  
Noncurrent liabilities (19,261) (17,064)  
Amounts recognized in the Consolidated Balance Sheets (20,335) (18,228)  
Amounts recognized in accumulated other comprehensive loss      
Actuarial net (gain) loss 4,979 2,569  
Prior service cost (credit) (19,619) (22,647)  
Amounts recognized in accumulated other comprehensive loss $ (14,640) $ (20,078)