| Summary of Cash, Cash Equivalents and Short-Term and Long-Term Investments by Significant Investment Category |
The following tables show the Company’s cash, cash equivalents, short-term and long-term investments by significant investment category as of September 30, 2018 and December 31, 2017 (in thousands):
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September 30, 2018
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Adjusted Cost
|
|
|
Unrealized Gains
|
|
|
Unrealized Losses
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|
|
Fair
Value
|
|
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Cash and Cash Equivalents
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|
|
|
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Short-Term Investments
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|
|
|
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Long-Term Investments
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|
|
Cash
|
|
$
|
628,753
|
|
|
$
|
-
|
|
|
$
|
-
|
|
|
$
|
628,753
|
|
|
$
|
628,753
|
|
|
|
|
$
|
-
|
|
|
|
|
$
|
-
|
|
|
Level 1:
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Money market funds
|
|
|
159,815
|
|
|
|
-
|
|
|
|
-
|
|
|
|
159,815
|
|
|
|
159,815
|
|
|
|
|
|
-
|
|
|
|
|
|
-
|
|
|
U.S. Treasury securities
|
|
|
14,203
|
|
|
|
|
|
|
|
|
|
|
|
14,203
|
|
|
|
14,203
|
|
|
|
|
|
-
|
|
|
|
|
|
-
|
|
|
Mutual funds
|
|
|
21,308
|
|
|
|
-
|
|
|
|
-
|
|
|
|
21,308
|
|
|
|
-
|
|
|
|
|
|
-
|
|
|
|
|
|
21,308
|
|
|
Total level 1
|
|
|
195,326
|
|
|
|
-
|
|
|
|
-
|
|
|
|
195,326
|
|
|
|
174,018
|
|
|
|
|
|
-
|
|
|
|
|
|
21,308
|
|
|
Level 2:
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
-
|
|
|
|
|
|
-
|
|
|
|
|
|
-
|
|
|
Corporate notes and bonds
|
|
|
150,776
|
|
|
|
-
|
|
|
|
-
|
|
|
|
150,776
|
|
|
|
-
|
|
|
|
|
|
85,227
|
|
|
|
|
|
65,549
|
|
|
U.S. Agency securities
|
|
|
6,279
|
|
|
|
|
|
|
|
|
|
|
|
6,279
|
|
|
|
-
|
|
|
|
|
|
2,050
|
|
|
|
|
|
4,229
|
|
|
Total level 2
|
|
|
157,055
|
|
|
|
-
|
|
|
|
-
|
|
|
|
157,055
|
|
|
|
-
|
|
|
|
|
|
87,277
|
|
|
|
|
|
69,778
|
|
|
TOTAL
|
|
$
|
981,134
|
|
|
$
|
-
|
|
|
$
|
-
|
|
|
$
|
981,134
|
|
|
$
|
802,771
|
|
|
|
|
$
|
87,277
|
|
|
|
|
$
|
91,086
|
|
|
|
|
December 31, 2017
|
|
|
|
|
Adjusted Cost
|
|
|
Unrealized Gains
|
|
|
Unrealized Losses
|
|
|
Fair
Value
|
|
|
Cash and Cash Equivalents
|
|
|
Short-Term Investments
|
|
|
Long-Term Investments
|
|
|
Cash
|
|
$
|
736,431
|
|
|
$
|
-
|
|
|
$
|
-
|
|
|
$
|
736,431
|
|
|
$
|
736,431
|
|
|
$
|
-
|
|
|
$
|
-
|
|
|
Level 1:
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Mutual funds
|
|
|
17,396
|
|
|
|
-
|
|
|
|
-
|
|
|
|
17,396
|
|
|
|
-
|
|
|
|
-
|
|
|
|
17,396
|
|
|
TOTAL
|
|
$
|
753,827
|
|
|
$
|
-
|
|
|
$
|
-
|
|
|
$
|
753,827
|
|
|
$
|
736,431
|
|
|
$
|
-
|
|
|
$
|
17,396
|
|
|