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Marketable Securities | 3 Months Ended
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Mar. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Marketable Securities |
3 | Marketable Securities
The Company’s marketable securities within cash equivalents and investments included in the consolidated balance sheets are detailed as follows (in thousands):
|  | March 31, 2018 |
|  | Amortized Cost |  |  | Unrealized Gain |  |  | Unrealized Loss |  |  | Fair Value |
U.S. Treasury securities |  | $ | 426,999 |  |  | $ | 1 |  |  | $ | (1,968 | ) |  | $ | 425,032 |
Foreign government securities |  |  | 6,987 |  |  |  | — |  |  |  | (40 | ) |  |  | 6,947 |
Corporate debt securities |  |  | 1,297,659 |  |  |  | 328 |  |  |  | (5,109 | ) |  |  | 1,292,878 |
Time deposits |  |  | 301,279 |  |  |  | — |  |  |  | (2 | ) |  |  | 301,277 |
Equity securities |  |  | 77 |  |  |  | 70 |  |  |  | — |  |  |  | 147 |
Total |  | $ | 2,033,001 |  |  | $ | 399 |  |  | $ | (7,119 | ) |  | $ | 2,026,281 |
Amounts included in: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents |  | $ | 190,931 |  |  | $ | 1 |  |  | $ | (2 | ) |  | $ | 190,930 |
Investments |  |  | 1,842,070 |  |  |  | 398 |  |  |  | (7,117 | ) |  |  | 1,835,351 |
Total |  | $ | 2,033,001 |  |  | $ | 399 |  |  | $ | (7,119 | ) |  | $ | 2,026,281 |
|  | 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):
|  | March 31, 2018 |  |  | December 31, 2017 |
Due in one year or less |  | $ | 1,226,896 |  |  | $ | 1,722,553 |
Due after one year through three years |  |  | 497,961 |  |  |  | 851,547 |
Total |  | $ | 1,724,857 |  |  | $ | 2,574,100 |

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- Definition The entire disclosure for investments in certain debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -URI http://asc.fasb.org/topic&trid=2196928 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=4738149 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 940 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2176304 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 946 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2324412 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2209399 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 954 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=2289146 + Details
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