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Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss By Component) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance $ 729,686 $ 826,876 $ 749,944 $ 842,381
Other comprehensive income (loss) 712 (16,805) 4,245 (23,607)
Amounts reclassified from accumulated other comprehensive income (loss) 8 56 197 118
Ending balance 711,004 783,658 711,004 783,658
Accumulated Other Comprehensive Income (Loss)        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (50,100) (44,446) (53,822) (37,706)
Ending balance (49,380) (61,195) (49,380) (61,195)
Foreign currency translation adjustment        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (50,781) (38,810) (54,194) (35,464)
Other comprehensive income (loss) 712 (16,386) 4,125 (19,732)
Amounts reclassified from accumulated other comprehensive income (loss) 0 0 0 0
Ending balance (50,069) (55,196) (50,069) (55,196)
Defined benefit pension plan        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance 700 (2,141) 700 (2,242)
Other comprehensive income (loss) 0 109 12 148
Amounts reclassified from accumulated other comprehensive income (loss) (11) 56 (23) 118
Ending balance 689 (1,976) 689 (1,976)
Unrealized loss on short-term investments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (19) (3,495) (328) 0
Other comprehensive income (loss) 0 (528) 108 (4,023)
Amounts reclassified from accumulated other comprehensive income (loss) 19 0 220 0
Ending balance $ 0 $ (4,023) $ 0 $ (4,023)