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Fair Value Measurements (Available-For-Sale Marketable Securities) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Marketable securities classified as available-for-sale      
Cost or Amortized Cost $ 48,315   $ 58,110
Gross Unrealized Gains 7,356   4,310
Gross Unrealized Losses     (10)
Total Estimated Fair Value 55,671 $ 62,410 62,410
Realized gains on available-for-sale marketable securities $ 1,333    
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 $ 29,683   23,684
Gross Unrealized Gains 41   41
Total Estimated Fair Value 29,724   23,725
Corporate debt securities      
Marketable securities classified as available-for-sale      
Cost or Amortized Cost 7,021   20,569
Gross Unrealized Gains 1    
Gross Unrealized Losses     (10)
Total Estimated Fair Value 7,022   20,559
Corporate equity securities      
Marketable securities classified as available-for-sale      
Cost or Amortized Cost 11,611   13,857
Gross Unrealized Gains 7,314   4,269
Total Estimated Fair Value $ 18,925   $ 18,126