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Investments in Marketable Securities | 9 Months Ended
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Sep. 30, 2018
Marketable Securities [Abstract] |
Investments in Marketable Securities | Investments in Marketable Securities Investments in marketable securities at December 31, 2017 and September 30, 2018 were $77.8 million and $144.1 million, respectively. The following is a summary of the cost, gross unrealized gains and losses and fair value of Investments in marketable securities:
| December 31, 2017 |  | September 30, 2018
Cost | $ | 67.1 |  |  | $ | 128.3 |
Unrealized gains | 13.0 |  |  | 15.8 |
Unrealized losses | (2.3 | ) |  | (0.0 | )
Fair value | $ | 77.8 |  |  | $ | 144.1 |
In the three and nine months ended September 30, 2017, the Company received proceeds of $23.6 million and $81.9 million, respectively, from the sale of investments in marketable securities, and recorded net gains of $9.1 million and $24.2 million, respectively. In the three and nine months ended September 30, 2018, the Company received proceeds of $16.6 million and $42.6 million, respectively, from the sale of investments in marketable securities, and recorded net losses of $0.0 million and net gains of $4.0 million, respectively.

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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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