Stockholders' Equity (Schedule Of RSU Activity) (Details) - RSUs [Member] - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Balance as of December 31, Number of Shares	159	368	260
Options awarded, Number of Shares	688	7	170
Options Vested/Released, Number of shares	(105)	(212)	(39)
Options forfeited, Number of Shares		(4)	(23)
Balance as of December 31, Number of Shares	742	159	368
Balance as of December 31, Aggregate Intrinsic Value	$ 6,822	$ 1,393	$ 1,857	$ 1,121
Vested and expected to vest after December 31, 2015 Number of Shares	552
Vested and expected to vest after December 31, 2015 Aggregate Intrinsic Value	$ 5,077
Exercisable as of December 31, 2015 (Vested and deferred), Number of Shares
Exercisable as of December 31, 2015 (Vested and deferred), Aggregate Intrinsic Value