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Fair Value Measurements (Contractual Maturities Of Available For Sale Investments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Fair Value Disclosures [Abstract]    
Maturing in one year or less $ 2,290 $ 4,343
Maturing after one year through three years 6,665 4,041
Maturing after three years 2,844 3,415
Total debt securities $ 11,799 $ 11,799