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Investments (Tables) | 6 Months Ended
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Jun. 30, 2018
Investments [Abstract] |
Investment Securities Stated at Fair Value | As of June 30, 2018
|  |  | Fair Value Measurements at Reporting Date Using |  |  |  |
| Total as of |  | Quoted Prices in Active Markets for Identical Assets |  | Significant Other Observable |  | Significant Unobservable Inputs
Description | June 30, 2018 |  | (Level 1) |  | (Level 2) |  | (Level 3)
Cash & Cash Equivalents | $ | 296,699,141 |  | $ | 296,699,141 |  | $ | — |  | $ | —
Short-Term Investments: |  |  |  |  |  |  |
Certificate of Deposit | 160,017,640 |  | 160,017,640 |  | — |  | —
Corporate Bonds | 3,000,721 |  | — |  | 3,000,721 |  | —
Government Securities | 6,691,825 |  | — |  | 6,691,825 |  | —
Other | 1,310,620 |  | 1,310,620 |  | — |  | —
Long-Term Investments: |  |  |  |  |  |  |
Corporate Bonds | 64,396,193 |  | — |  | 64,396,193 |  | —
Government Securities | 55,897,881 |  | — |  | 55,897,881 |  | —
Common Stocks | 40,000 |  | 40,000 |  | — |  | —
Municipal Bonds | 17,771,621 |  | 17,771,621 |  | — |  | —
Total | $ | 605,825,642 |  | $ | 475,839,022 |  | $ | 129,986,620 |  | $ | —
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 | The amortized cost, unrealized gains and losses, and market value of investment securities are shown as of June 30, 2018, and December 31, 2017 As of June 30, 2018:
|  |  | Unrealized |  |  |  |
| Cost |  | Gains |  | Losses |  | Market Value
Short-Term Investments: |  |  |  |  |  |  |
Certificate of Deposit | $ | 160,003,990 |  | $ | 13,675 |  | $ | (25) |  | $ | 160,017,640
Government Securities | 6,693,257 |  | 280 |  | (1,712) |  | 6,691,825
Corporate Bonds | 3,011,806 |  | — |  | (11,085) |  | 3,000,721
Other | 1,310,620 |  | — |  | — |  | 1,310,620
Long-Term Investments: |  |  |  |  |  |  |
Corporate Bonds | 64,584,256 |  | 5,591 |  | (193,654) |  | 64,396,193
Government Securities | 55,912,057 |  | 22,868 |  | (37,044) |  | 55,897,881
Common Stocks | 40,000 |  | — |  | — |  | 40,000
Municipal Bonds | 17,842,453 |  | 5,782 |  | (76,614) |  | 17,771,621
Total | $ | 309,398,439 |  | $ | 48,196 |  | $ | (320,134) |  | $ | 309,126,501
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 June 30, 2018, are as follows:
| Aggregate Unrealized Losses |  | Aggregate Fair Value
Less than one year | $ | 320,134 |  | $ | 118,370,168
Greater than one year | — |  | —
Total | $ | 320,134 |  | $ | 118,370,168
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 June 30, 2018 have contractual maturities as follows:
Due within one year | $ | 169,743,770
Due between one and five years | 128,436,685
Due over five years | 10,411,957
| $ | 308,592,412

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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 Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + 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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