Income Taxes (Schedule Of Changes In Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Abstract]
Total amounts of unrecognized tax benefits, beginning of period	$ 5,942	$ 6,325	$ 5,906
Gross increases in unrecognized tax benefits as a result of tax positions taken during a prior period	47	432	8
Gross increases in unrecognized tax benefits as a result of tax positions taken in the current period	1,569	1,789	1,954
Decreases in unrecognized tax benefits relating to settlements with taxing authorities		(2,242)	(317)
Decreases in unrecognized tax benefits as a result of a lapse of the applicable statutes of limitations	(354)	(362)	(1,226)
Total amounts of unrecognized tax benefits, end of period	$ 7,204	$ 5,942	$ 6,325