| Summary of Cash, Cash Equivalents, 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 December 31, 2018 and 2017 (in thousands):
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December 31, 2018
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Adjusted Cost
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|
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Unrealized Gains
|
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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
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|
$
|
713,624
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|
$
|
-
|
|
|
$
|
-
|
|
|
$
|
713,624
|
|
|
$
|
713,624
|
|
|
|
|
$
|
-
|
|
|
|
|
$
|
-
|
|
|
Level 1:
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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Money market funds
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|
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158,613
|
|
|
|
-
|
|
|
|
-
|
|
|
|
158,613
|
|
|
|
158,613
|
|
|
|
|
|
-
|
|
|
|
|
|
-
|
|
|
U.S. Treasury securities
|
|
|
6,955
|
|
|
|
-
|
|
|
|
-
|
|
|
|
6,955
|
|
|
|
-
|
|
|
|
|
|
4,979
|
|
|
|
|
|
1,976
|
|
|
Total level 1
|
|
|
165,568
|
|
|
|
-
|
|
|
|
-
|
|
|
|
165,568
|
|
|
|
158,613
|
|
|
|
|
|
4,979
|
|
|
|
|
|
1,976
|
|
|
Level 2:
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
-
|
|
|
|
|
|
-
|
|
|
|
|
|
-
|
|
|
Corporate notes and bonds
|
|
|
132,280
|
|
|
|
-
|
|
|
|
-
|
|
|
|
132,280
|
|
|
|
-
|
|
|
|
|
|
88,412
|
|
|
|
|
|
43,868
|
|
|
Asset-backed securities
|
|
|
23,310
|
|
|
|
-
|
|
|
|
-
|
|
|
|
23,310
|
|
|
|
-
|
|
|
|
|
|
2,115
|
|
|
|
|
|
21,195
|
|
|
U.S. Agency securities
|
|
|
10,272
|
|
|
|
-
|
|
|
|
-
|
|
|
|
10,272
|
|
|
|
-
|
|
|
|
|
|
4,523
|
|
|
|
|
|
5,749
|
|
|
Mutual funds
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|
|
20,957
|
|
|
|
-
|
|
|
|
-
|
|
|
|
20,957
|
|
|
|
-
|
|
|
|
|
|
-
|
|
|
|
|
|
20,957
|
|
|
Total level 2
|
|
|
186,819
|
|
|
|
-
|
|
|
|
-
|
|
|
|
186,819
|
|
|
|
-
|
|
|
|
|
|
95,050
|
|
|
|
|
|
91,769
|
|
|
TOTAL
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|
$
|
1,066,011
|
|
|
$
|
-
|
|
|
$
|
-
|
|
|
$
|
1,066,011
|
|
|
$
|
872,237
|
|
|
|
|
$
|
100,029
|
|
|
|
|
$
|
93,745
|
|
|
|
|
December 31, 2017
|
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|
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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 2:
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|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
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Mutual funds
|
|
|
17,396
|
|
|
|
-
|
|
|
|
-
|
|
|
|
17,396
|
|
|
|
-
|
|
|
|
-
|
|
|
|
17,396
|
|
|
TOTAL
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|
$
|
753,827
|
|
|
$
|
-
|
|
|
$
|
-
|
|
|
$
|
753,827
|
|
|
$
|
736,431
|
|
|
$
|
-
|
|
|
$
|
17,396
|
|
|