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Marketable Securities | 12 Months Ended
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Dec. 31, 2017
Marketable 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):
|  |  | December 31, 2017
|  |  | Amortized |  | Unrealized |  | Unrealized |  | Fair
|  |  | Cost |  | Gain |  | Loss |  | 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
|  |  | December 31, 2016
|  |  | Amortized |  | Unrealized |  | Unrealized |  | Fair
|  |  | Cost |  | Gain |  | Loss |  | Value
U.S. Treasury securities |  | $ | 570,695 |  | $ | 253 |  | $ | (635) |  | $ | 570,313
Foreign government securities |  |  | 17,999 |  |  | - |  |  | (8) |  |  | 17,991
Corporate debt securities |  |  | 1,645,468 |  |  | 496 |  |  | (2,126) |  |  | 1,643,838
Time deposits |  |  | 199,906 |  |  | - |  |  | - |  |  | 199,906
Equity securities |  |  | 77 |  |  | 70 |  |  | - |  |  | 147
| Total |  | $ | 2,434,145 |  | $ | 819 |  | $ | (2,769) |  | $ | 2,432,195
Amounts included in: |  |  |  |  |  |  |  |  |  |  |  |
| Cash equivalents |  | $ | 124,793 |  | $ | 1 |  | $ | - |  | $ | 124,794
| Investments |  |  | 2,309,352 |  |  | 818 |  |  | (2,769) |  |  | 2,307,401
| Total |  | $ | 2,434,145 |  | $ | 819 |  | $ | (2,769) |  | $ | 2,432,195
The estimated fair value of marketable debt securities by maturity date is as follows (in thousands):
|  |  | December 31, 2017 |  | December 31, 2016
Due in one year or less |  | $ | 1,722,553 |  | $ | 1,388,537
Due after one year through three years |  |  | 851,547 |  |  | 843,605
| Total |  | $ | 2,574,100 |  | $ | 2,232,142
Realized gains and losses on sales of investments were not material in 2017, 2016 and 2015.

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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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