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Fair Value Measurements (Available-For-Sale Marketable Securities) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Marketable securities classified as available-for-sale      
Cost or Amortized Cost $ 50,927 $ 50,927 $ 58,110
Gross Unrealized Gains 1,970 1,970 4,310
Gross Unrealized Losses (3) (3) (10)
Total Estimated Fair Value 52,894 52,894 $ 62,410
Realized gains on available-for-sale marketable securities 676 $ 2,009  
Maximum contractual maturities of Company's available-for-sale marketable securities   1 year 1 year
Commercial paper      
Marketable securities classified as available-for-sale      
Cost or Amortized Cost 27,164 $ 27,164 $ 23,684
Gross Unrealized Gains 60 60 41
Total Estimated Fair Value 27,224 27,224 23,725
Corporate debt securities      
Marketable securities classified as available-for-sale      
Cost or Amortized Cost 13,014 13,014 20,569
Gross Unrealized Gains 3 3  
Gross Unrealized Losses (3) (3) (10)
Total Estimated Fair Value 13,014 13,014 20,559
Corporate equity securities      
Marketable securities classified as available-for-sale      
Cost or Amortized Cost 10,749 10,749 13,857
Gross Unrealized Gains 1,907 1,907 4,269
Total Estimated Fair Value $ 12,656 $ 12,656 $ 18,126