Stock Compensation (Summary Of Total Stock Compensation Expenses) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock compensation expense	$ 2,689	$ 1,981
RSA, RSU, And PSU Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock compensation expense	2,156	1,510
Stock Option And ESPP Expense [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total stock compensation expense	$ 533	$ 471