Goodwill And Other Intangible Assets (Schedule Of Amortization Expense) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill And Other Intangible Assets [Abstract]
Amortization of intangible assets	$ 10,065	$ 11,838	$ 4,962
Amortization of capitalized purchased software costs	1,078	1,147	1,785
Amortization of debt costs	861	756	103
Total amortization	$ 12,004	$ 13,741	$ 6,850