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
Mar. 31, 2016
Dec. 31, 2015
Adjusted Cost    
Due in one year or less $ 239,998 $ 266,205
Due after one year through three years 33,248 46,655
Total 273,246 312,860
Fair Value    
Due in one year or less 239,972 266,150
Due after one year through three years 33,238 46,369
Total $ 273,210 $ 312,519