XML 56 R38.htm IDEA: XBRL DOCUMENT v3.3.1.900
FAIR VALUE MEASUREMENT AND MARKETABLE SECURITIES (Details 1) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Adjusted Cost $ 322,151 $ 33,076
Gross Unrealized Gains 39 68
Gross Unrealized Losses 1,814 249
Aggregate fair value 320,376 32,895
U.S. government treasuries    
Schedule of Available-for-sale Securities [Line Items]    
Adjusted Cost 10,898 5,794
Gross Unrealized Gains 1 12
Gross Unrealized Losses 25 13
Aggregate fair value 10,874 5,793
Corporate debentures    
Schedule of Available-for-sale Securities [Line Items]    
Adjusted Cost 311,253 27,282
Gross Unrealized Gains 38 56
Gross Unrealized Losses 1,789 236
Aggregate fair value $ 309,502 $ 27,102