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Investments (Tables) | 3 Months Ended
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Mar. 31, 2018
Investments [Abstract] |
Investment Securities Stated at Fair Value | As of March 31, 2018:
|  |  | Fair Value Measurements at Reporting Date Using
| Total as of |  | Quoted Prices in Active Markets for Identical Assets |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs
Description | March 31, 2018 |  | (Level 1) |  | (Level 2) |  | (Level 3)
Cash & Cash Equivalents | $ | 524,323,560 |  | $ | 524,323,560 |  | $ | — |  | $ | —
Short-Term Investments: |  |  |  |  |  |  |
Certificate of Deposit | 130,000,000 |  | 130,000,000 |  | — |  | —
Corporate Bonds | 15,891,817 |  | — |  | 15,891,817 |  | —
Government Securities | 6,003,510 |  | — |  | 6,003,510 |  | —
Other | 284,081 |  | 284,081 |  | — |  | —
Long-Term Investments: |  |  |  |  |  |  |
Common Stocks | 40,000 |  | 40,000 |  | — |  | —
Total | $ | 676,542,968 |  | $ | 654,647,641 |  | $ | 21,895,327 |  | $ | —
As of December 31, 2017:
|  |  | Fair Value Measurements at Reporting Date Using
| Total as of |  | Quoted Prices in Active Markets for Identical Assets |  | Significant Other Observable Inputs |  | Significant Unobservable Inputs
Description | December 31, 2017 |  | (Level 1) |  | (Level 2) |  | (Level 3)
Cash & Cash Equivalents | $ | 569,734,496 |  | $ | 569,734,496 |  | $ | — |  | $ | —
Short-Term Investments: |  |  |  |  |  |  |
Certificate of Deposit | 130,000,000 |  | 130,000,000 |  | — |  | —
Government Securities | 9,011,130 |  | — |  | 9,011,130 |  | —
Mutual Funds | 393,581 |  | — |  | 393,581 |  | —
Corporate Bonds | 12,944,999 |  | — |  | 12,944,999 |  | —
Other | 188,344 |  | 188,344 |  | — |  | —
Long-Term Investments: |  |  |  |  |  |  |
Corporate Bonds | 3,018,720 |  | — |  | 3,018,720 |  | —
Common Stocks | 15,703,371 |  | 15,703,371 |  | — |  | —
Mutual Funds | 34,681,337 |  | 34,681,337 |  | — |  | —
Preferred Stock | 1,178,991 |  | 1,178,991 |  | — |  | —
Total | $ | 776,854,969 |  | $ | 751,486,539 |  | $ | 25,368,430 |  | $ | —
Schedule of Amortized Cost, Unrealized Gains And Losses, And Market Value of Investment Securities | As of March 31, 2018:
|  |  | Unrealized |  |
| Cost |  | Gains |  | Losses |  | Market Value
Short-Term Investments: |  |  |  |  |  |  |
Certificate of Deposit | $ | 130,000,000 |  | $ | — |  | $ | — |  | $ | 130,000,000
Government Securities | 6,009,310 |  | — |  | (5,800) |  | 6,003,510
Corporate Bonds | 15,919,177 |  | — |  | (27,360) |  | 15,891,817
Other | 284,081 |  | — |  | — |  | 284,081
Long-Term Investments: |  |  |  |  |  |  |
Common Stocks | 40,000 |  | — |  | — |  | 40,000
Total | $ | 152,252,568 |  | $ | — |  | $ | (33,160) |  | $ | 152,219,408
As of December 31, 2017:
|  |  | Unrealized |  |
| Cost |  | Gains |  | Losses |  | Market Value
Short-Term Investments: |  |  |  |  |  |  |
Certificate of Deposit | $ | 130,000,000 |  | $ | — |  | $ | — |  | $ | 130,000,000
Government Securities | 9,024,777 |  | — |  | (13,647) |  | 9,011,130
Mutual Funds | 392,482 |  | 1,575 |  | (476) |  | 393,581
Corporate Bonds | 12,952,229 |  | — |  | (7,230) |  | 12,944,999
Other | 188,344 |  | — |  | — |  | 188,344
Long-Term Investments: |  |  |  |  |  |  |
Corporate Bonds | 3,022,994 |  | — |  | (4,274) |  | 3,018,720
Common Stocks | 10,897,219 |  | 5,079,815 |  | (273,663) |  | 15,703,371
Mutual Funds | 29,306,540 |  | 5,440,344 |  | (65,547) |  | 34,681,337
Preferred Stock | 1,141,458 |  | 40,533 |  | (3,000) |  | 1,178,991
Total | $ | 196,926,043 |  | $ | 10,562,267 |  | $ | (367,837) |  | $ | 207,120,473
Schedule of Unrealized Loss on Investments | Unrealized losses on investments as of March 31, 2018, are as follows:
| Aggregate Unrealized Losses |  | Aggregate Fair Value
Less than one year | $ | 33,160 |  | $ | 21,895,327
Greater than one year | — |  | —
Total | $ | 33,160 |  | $ | 21,895,327
Unrealized losses on investments as of December 31, 2017, are as follows:
| Aggregate Unrealized Losses |  | Aggregate Fair Value
Less than one year | $ | 263,655 |  | $ | 31,223,557
Greater than one year | 104,182 |  | 285,077
Total | $ | 367,837 |  | $ | 31,508,634
Investments Classified by Contractual Maturity Date | Fixed income securities as of March 31, 2018 have contractual maturities as follows:
Due within one year | $ | 151,895,327
Due between one and five years | —
Due over five years | —
| $ | 151,895,327

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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