Fair Value Measurements (Contractual Maturities Of Available For Sale Investments) (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Value Disclosures [Abstract]
Maturing in one year or less	$ 2,543	$ 4,343
Maturing in second year through fifth year	18,353	7,456
Maturing in sixth year through tenth year	23,447	0
Maturing after ten years	14,856	0
Total debt securities	$ 59,199	$ 11,799