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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Changes in Plan Assets:      
Fair value of plan assets at beginning of year $ 123,463    
Fair value of plan assets at end of year 115,199 $ 123,463  
U.S. [Member]      
Changes in Benefit Obligation:      
Net benefit obligation at beginning of year 139,746 140,230  
Service cost 1,315 1,305 $ 1,325
Interest cost 4,709 5,352 5,744
Participant contributions 0 0  
Foreign currency exchange rates 0 0  
Actuarial (gain) loss (8,297) 3,212  
Gross benefits paid 10,488 10,353  
Net benefit obligation at end of year 126,985 139,746 140,230
Changes in Plan Assets:      
Fair value of plan assets at beginning of year 109,845 100,905  
Actual return on plan assets (5,091) 12,620  
Foreign currency exchange rate changes 0  
Employer contributions 5,579 6,673  
Participant contributions 0  
Gross benefits paid (10,488) (10,353)  
Fair value of plan assets at end of year 99,845 109,845 100,905
Funded status (underfunded): (27,140) (29,901)  
Prior service credit 0 0  
Non-current assets 0  
Current liabilities (430) (433)  
Non-current liabilities (26,710) (29,468)  
Net amount recognized (27,140) (29,901)  
U.S. [Member] | Postretirement Benefit Costs [Member]      
Changes in Benefit Obligation:      
Net benefit obligation at beginning of year 8,461 10,175  
Service cost 0 0 0
Interest cost 264 333 360
Foreign currency exchange rates 0 0  
Actuarial (gain) loss 1,028 1,257  
Gross benefits paid 532 790  
Plan amendment 0 0  
Net benefit obligation at end of year 7,165 8,461 10,175
Changes in Plan Assets:      
Fair value of plan assets at beginning of year 0 0  
Employer contributions 532 790  
Gross benefits paid (532) (790)  
Fair value of plan assets at end of year 0 0 0
Funded status (underfunded): (7,165) (8,461)  
Prior service credit 0 0  
Current liabilities (783) (855)  
Non-current liabilities (6,382) (7,606)  
Net amount recognized (7,165) (8,461)  
Foreign [Member]      
Changes in Benefit Obligation:      
Net benefit obligation at beginning of year 20,407 18,237  
Service cost 674 710 698
Interest cost 253 199 243
Participant contributions 392 252  
Foreign currency exchange rates (339) 1,069  
Actuarial (gain) loss 711 63  
Gross benefits paid 234 123  
Net benefit obligation at end of year 22,332 20,407 18,237
Changes in Plan Assets:      
Fair value of plan assets at beginning of year 13,618 11,871  
Actual return on plan assets 538 415  
Foreign currency exchange rate changes (154) 545  
Employer contributions 726 658  
Participant contributions 392 252  
Gross benefits paid (234) (123)  
Fair value of plan assets at end of year 15,354 13,618 11,871
Funded status (underfunded): (6,978) (6,789)  
Prior service credit 0 0  
Non-current assets 147 0  
Current liabilities (117) (146)  
Non-current liabilities (7,008) (6,643)  
Net amount recognized (6,978) (6,789)  
Foreign [Member] | Postretirement Benefit Costs [Member]      
Changes in Benefit Obligation:      
Net benefit obligation at beginning of year 12,172 10,700  
Service cost 1 2 4
Interest cost 700 653 764
Foreign currency exchange rates (1,333) 931  
Actuarial (gain) loss (47) (742)  
Gross benefits paid 926 856  
Plan amendment 0 0  
Net benefit obligation at end of year 10,661 12,172 10,700
Changes in Plan Assets:      
Fair value of plan assets at beginning of year 0 0  
Employer contributions 926 856  
Gross benefits paid (926) (856)  
Fair value of plan assets at end of year 0 0 $ 0
Funded status (underfunded): (10,661) (12,172)  
Prior service credit 0 0  
Current liabilities (851) (912)  
Non-current liabilities (9,810) (11,260)  
Net amount recognized $ (10,661) $ (12,172)