Goodwill and Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 179,528	$ 176,723
Accumulated amortization	(121,256)	(118,537)
Net carrying amount	58,272	58,186
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	100,072	100,072
Accumulated amortization	(67,544)	(65,958)
Net carrying amount	32,528	34,114
Capitalized Purchased Software Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	55,288	52,483
Accumulated amortization	37,832	36,702
Net carrying amount	17,456	15,781
Technology Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	15,500	15,500
Accumulated amortization	(15,500)	(15,500)
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	(380)	(377)
Net carrying amount	$ 488	$ 491