XML 59 R46.htm IDEA: XBRL DOCUMENT v3.5.0.2
Investments (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Summary of Investments    
Available-for-sale securities, Amortized Cost $ 294,511 $ 238,568
Available-for-sale securities, Gross Unrealized Gains 924 5
Available-for-sale securities, Gross Unrealized Losses (76) (947)
Available-for-sale securities, Estimated Fair Value 295,359 237,626
Securities in a loss position for 12 months or longer 0  
Corporate debt securities    
Summary of Investments    
Available-for-sale securities due in one year or less, Amortized Cost 121,864 27,964
Available-for-sale securities due in one to three years, Amortized Cost 131,564 173,652
Available-for-sale securities due in one year or less, Gross Unrealized Gains 30  
Available-for-sale securities due in one to three years, Gross Unrealized Gains 846 3
Available-for-sale securities due in one year or less, Gross Unrealized Losses (40) (38)
Available-for-sale securities due in one to three years, Gross Unrealized Losses (36) (904)
Available-for-sale securities due in one year or less, Estimated Fair Value 121,854 27,926
Available-for-sale securities due in one to three years, Estimated Fair Value 132,374 172,751
U.S. treasury and government agency securities    
Summary of Investments    
Available-for-sale securities due in one year or less, Amortized Cost 1,044  
Available-for-sale securities due in one to three years, Amortized Cost 4,895  
Available-for-sale securities due in one year or less, Gross Unrealized Gains 1  
Available-for-sale securities due in one to three years, Gross Unrealized Gains 46  
Available-for-sale securities due in one year or less, Estimated Fair Value 1,045  
Available-for-sale securities due in one to three years, Estimated Fair Value 4,941  
Commercial Paper    
Summary of Investments    
Available-for-sale securities due in one year or less, Amortized Cost 32,644 34,452
Available-for-sale securities due in one year or less, Gross Unrealized Gains   2
Available-for-sale securities due in one year or less, Gross Unrealized Losses   (5)
Available-for-sale securities due in one year or less, Estimated Fair Value 32,644 34,449
Municipal securities    
Summary of Investments    
Available-for-sale securities due in one year or less, Amortized Cost 2,500 2,500
Available-for-sale securities due in one year or less, Gross Unrealized Gains 1  
Available-for-sale securities due in one year or less, Estimated Fair Value $ 2,501 $ 2,500