Income Taxes (Changes In Gross Liability For Unrecognized Tax Benefits Excluding Interest And Penalties) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning of period	$ 72,230	$ 55,539
Increase in unrecognized tax benefits for tax positions taken in a prior period	940	9,513
Decrease in unrecognized tax benefits for tax positions taken in a prior period	(9,783)	(3,749)
Increase in unrecognized tax benefits for tax positions taken in the current period	3,355	13,779
Settlements with taxing authorities	(5,331)	(2,852)
Unrecognized tax benefits, end of period	$ 61,411	$ 72,230