Accumulated Other Comprehensive Loss (Schedule Of Accumulated Other Comprehensive Loss By Component) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated other comprehensive income loss [Line Items]
Accumulated other comprehensive loss, net of tax, beginning balance	$ (11,124)
Other comprehensive loss before reclassifications	(1,850)
Amounts reclassified from accumulated other comprehensive loss, net of tax	(283)
Other comprehensive income (loss)	(2,133)	$ 2,165
Accumulated other comprehensive loss, net of tax, ending balance	(13,257)
Foreign currency translaction adjustments [Member]
Accumulated other comprehensive income loss [Line Items]
Accumulated other comprehensive loss, net of tax, beginning balance	(11,840)
Other comprehensive loss before reclassifications	(833)
Amounts reclassified from accumulated other comprehensive loss, net of tax	0
Other comprehensive income (loss)	(833)
Accumulated other comprehensive loss, net of tax, ending balance	(12,673)
Derivative instruments, net of tax [Member]
Accumulated other comprehensive income loss [Line Items]
Accumulated other comprehensive loss, net of tax, beginning balance	116
Other comprehensive loss before reclassifications	(1,017)
Amounts reclassified from accumulated other comprehensive loss, net of tax	(268)
Other comprehensive income (loss)	(1,285)
Accumulated other comprehensive loss, net of tax, ending balance	(1,169)
Other, net of tax [Member]
Accumulated other comprehensive income loss [Line Items]
Accumulated other comprehensive loss, net of tax, beginning balance	600
Other comprehensive loss before reclassifications	0
Amounts reclassified from accumulated other comprehensive loss, net of tax	(15)
Other comprehensive income (loss)	(15)
Accumulated other comprehensive loss, net of tax, ending balance	$ 585