Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 179,195	$ 176,683
Accumulated amortization	(103,402)	(92,578)
Net carrying amount	75,793	84,105
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	100,123	100,146
Accumulated amortization	(46,981)	(40,661)
Net carrying amount	53,142	59,485
Purchased Software Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	41,604	39,069
Accumulated amortization	(32,012)	(30,626)
Net carrying amount	9,592	8,443
Technology Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	28,800	28,800
Accumulated amortization	(24,100)	(21,006)
Net carrying amount	4,700	7,794
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	(309)	(285)
Net carrying amount	$ 559	$ 583