Goodwill And Other Intangible Assets (Schedule Of Other Intangible Assets) (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	$ 169,958	$ 167,103
Accumulated amortization	(79,464)	(70,817)
Net carrying amount	90,494	96,286
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	100,183	100,053
Accumulated amortization	(32,770)	(27,883)
Net carrying amount	67,413	72,170
Purchased Software Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	34,307	31,582
Accumulated amortization	(29,327)	(28,508)
Net carrying amount	4,980	3,074
Technology Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Gross carrying amount	26,800	26,800
Accumulated amortization	(17,112)	(14,189)
Net carrying amount	9,688	12,611
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	(255)	(237)
Net carrying amount	$ 613	$ 631