Fair Value Measurements And Marketable Securities (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Fair Value Disclosures [Abstract]
Proceeds from maturities or sales of available-for-sale securities	$ 2,200	$ 2,600	$ 3,300