Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 184,196	$ 185,392
Accumulated amortization	(121,968)	(121,161)
Net carrying amount	62,228	64,231
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	100,113	100,136
Accumulated amortization	(61,243)	(59,680)
Net carrying amount	38,870	40,456
Purchased Software Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	48,615	49,788
Accumulated amortization	(33,563)	(34,325)
Net carrying amount	15,052	15,463
Technology Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	26,800	26,800
Accumulated amortization	(26,800)	(26,800)
Net carrying amount	0	0
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	(362)	(356)
Net carrying amount	$ 506	$ 512