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Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss By Component) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Accumulated other comprehensive income loss [Line Items]      
Accumulated other comprehensive loss, net of tax, beginning balance $ (16,759) $ (11,124) $ (8,149)
Other comprehensive gain (loss) before reclassifications 1,226 (4,393) (2,739)
Amounts reclassified from accumulated other comprehensive loss (1,118) (1,242) (236)
Other comprehensive gain (loss) 108 (5,635) (2,975)
Accumulated other comprehensive loss, net of tax, ending balance (16,651) (16,759) (11,124)
Foreign currency translation adjustments [Member]      
Accumulated other comprehensive income loss [Line Items]      
Accumulated other comprehensive loss, net of tax, beginning balance (12,425) (11,840) (9,567)
Other comprehensive gain (loss) before reclassifications 4,050 (585) (2,273)
Other comprehensive gain (loss) 4,050 (585) (2,273)
Accumulated other comprehensive loss, net of tax, ending balance (8,375) (12,425) (11,840)
Derivative instruments, net of tax [Member]      
Accumulated other comprehensive income loss [Line Items]      
Accumulated other comprehensive loss, net of tax, beginning balance (3,600) 116 1,478
Other comprehensive gain (loss) before reclassifications (2,024) (2,474) (1,126)
Amounts reclassified from accumulated other comprehensive loss (1,118) (1,242) (236)
Other comprehensive gain (loss) (3,142) (3,716) (1,362)
Accumulated other comprehensive loss, net of tax, ending balance (6,742) (3,600) 116
Unrealized loss on investments, net of tax [Member]      
Accumulated other comprehensive income loss [Line Items]      
Accumulated other comprehensive loss, net of tax, beginning balance     (41)
Other comprehensive gain (loss) before reclassifications     41
Other comprehensive gain (loss)     41
Other, net of tax [Member]      
Accumulated other comprehensive income loss [Line Items]      
Accumulated other comprehensive loss, net of tax, beginning balance (734) 600 (19)
Other comprehensive gain (loss) before reclassifications (800) (1,334) 619
Other comprehensive gain (loss) (800) (1,334) 619
Accumulated other comprehensive loss, net of tax, ending balance $ (1,534) $ (734) $ 600