Quarterly report pursuant to Section 13 or 15(d)

Cash, Cash Equivalents and Investments - Schedule of available-for-sale investments by contractual maturity date (Details)

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Cash, Cash Equivalents and Investments - Schedule of available-for-sale investments by contractual maturity date (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Adjusted Cost    
Due in one year or less $ 225,395 $ 266,205
Due after one year through three years 18,117 46,655
Total 243,512 312,860
Fair Value    
Due in one year or less 225,411 266,150
Due after one year through three years 18,153 46,369
Total $ 243,564 $ 312,519