Income Taxes (Changes In Gross Liability For Unrecognized Tax Benefits Excluding Interest And Penalties) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning of period	$ 73,100	$ 64,200
Increase in unrecognized tax benefits for tax positions taken in a prior period	2,828	9,149
Decrease in unrecognized tax benefits for tax positions taken in a prior period	(21,061)	(1,993)
Increase in unrecognized tax benefits for tax positions taken in the current period	7,402	6,302
Statute lapses	(1,907)	(2,465)
Settlements with taxing authorities	(4,823)	(2,093)
Unrecognized tax benefits, end of period	$ 55,539	$ 73,100