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Marketable Securities | 12 Months Ended
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Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities | 4 Marketable Securities The Company’s marketable securities within cash equivalents and investments included in the consolidated balance sheets are detailed as follows (in thousands):
|  | December 31, 2018 |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gain |  |  | Loss |  |  | Value |
U.S. Treasury securities |  | $ | 164,619 |  |  | $ | 16 |  |  | $ | (320 | ) |  | $ | 164,315 |
Foreign government securities |  |  | 3,486 |  |  |  | 1 |  |  |  | (24 | ) |  |  | 3,463 |
Corporate debt securities |  |  | 725,778 |  |  |  | 41 |  |  |  | (2,760 | ) |  |  | 723,059 |
Time deposits |  |  | 108,638 |  |  |  | — |  |  |  | — |  |  |  | 108,638 |
Total |  | $ | 1,002,521 |  |  | $ | 58 |  |  | $ | (3,104 | ) |  | $ | 999,475 |
Amounts included in: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 60,532 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 60,531 |
Investments |  |  | 941,989 |  |  |  | 58 |  |  |  | (3,103 | ) |  |  | 938,944 |
Total |  | $ | 1,002,521 |  |  | $ | 58 |  |  | $ | (3,104 | ) |  | $ | 999,475 |
|  | December 31, 2017 |
|  | Amortized Cost |  |  | Unrealized Gain |  |  | Unrealized Loss |  |  | Fair Value |
U.S. Treasury securities |  | $ | 593,599 |  |  | $ | 82 |  |  | $ | (1,693 | ) |  | $ | 591,988 |
Foreign government securities |  |  | 6,982 |  |  |  | — |  |  |  | (30 | ) |  |  | 6,952 |
Corporate debt securities |  |  | 1,977,329 |  |  |  | 897 |  |  |  | (3,066 | ) |  |  | 1,975,160 |
Time deposits |  |  | 371,515 |  |  |  | — |  |  |  | (4 | ) |  |  | 371,511 |
Equity securities |  |  | 77 |  |  |  | 70 |  |  |  | — |  |  |  | 147 |
Total |  | $ | 2,949,502 |  |  | $ | 1,049 |  |  | $ | (4,793 | ) |  | $ | 2,945,758 |
Amounts included in: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 194,377 |  |  | $ | — |  |  | $ | (1 | ) |  | $ | 194,376 |
Investments |  |  | 2,755,125 |  |  |  | 1,049 |  |  |  | (4,792 | ) |  |  | 2,751,382 |
Total |  | $ | 2,949,502 |  |  | $ | 1,049 |  |  | $ | (4,793 | ) |  | $ | 2,945,758 |
The estimated fair value of marketable debt securities by maturity date is as follows (in thousands):
|  | December 31, |
|  | 2018 |  |  | 2017 |
Due in one year or less |  | $ | 797,649 |  |  | $ | 2,042,673 |
Due after one year through three years |  |  | 201,826 |  |  |  | 902,938 |
Total |  | $ | 999,475 |  |  | $ | 2,945,611 |
In 2018, net realized losses on sales of investments were $1 million. Realized gains and losses on sales of investments were not material in 2017 and 2016.

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 + Details
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