Income Taxes (Components Of Provision For Income Taxes) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current provision:
State	$ 5,513	$ 1,535	$ 2,752
Foreign	11,681	8,121	6,314
Total current	17,194	9,656	9,066
Deferred provision (benefit) for taxes:
Federal	18,736	170,177	(3,023)
State	(241)	22,992	(3,106)
Foreign	9,155	30,425	(40,636)
Change in valuation allowance	(31,607)	(222,185)	46,760
Total deferred	(3,957)	1,409	(5)
Total provision for income taxes	$ 13,237	$ 11,065	$ 9,061