Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 180,957	$ 179,195
Accumulated amortization	(108,781)	(103,402)
Net carrying amount	72,176	75,793
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	100,124	100,123
Accumulated amortization	(50,154)	(46,981)
Net carrying amount	49,970	53,142
Purchased Software Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	43,365	41,604
Accumulated amortization	(32,637)	(32,012)
Net carrying amount	10,728	9,592
Technology Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	28,800	28,800
Accumulated amortization	(25,669)	(24,100)
Net carrying amount	3,131	4,700
Trade Names and Trademarks [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	7,800	7,800
Accumulated amortization	0	0
Net carrying amount	7,800	7,800
Other Intangible Assets [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	868	868
Accumulated amortization	(321)	(309)
Net carrying amount	$ 547	$ 559