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Investments (Schedule of Amortized Cost, Unrealized Gains And Losses, And Market Value of Investment Securities) (Details) - USD ($) | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Cash & Cash Equivalents | $ 580,579,352 | $ 546,477,075
Cost | 226,400,273 | 222,624,828
Unrealized Gains | 8,032,632 | 5,209,434
Unrealized Losses | (619,282) | (918,703)
Market Value | 233,813,623 | 226,915,559
Investments and Cash | 814,392,975 | 773,392,634
Short-term Investments [Member] | Certificates of Deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 130,000,000 | 130,000,000
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Market Value | 130,000,000 | 130,000,000
Short-term Investments [Member] | Government Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 17,058,035 | 14,003,644
Unrealized Gains | 0 | 0
Unrealized Losses | (29,435) | (10,164)
Market Value | 17,028,600 | 13,993,480
Short-term Investments [Member] | Mutual Funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost |  | 26,326,674
Unrealized Gains |  | 27,459
Unrealized Losses |  | (237,452)
Market Value | 26,525,181 | 26,116,681
Short-term Investments [Member] | Corporate Bond Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 10,761,522 | 6,706,721
Unrealized Gains | 1,839 | 0
Unrealized Losses | (6,073) | (8,339)
Market Value | 10,757,288 | 6,698,382
Short-term Investments [Member] | Other Debt Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 242,173 | 212,653
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Market Value | 242,173 | 212,653
Short-term Investments [Member] | Mutual Funds – Equity [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 26,611,888 |
Unrealized Gains | 51,791 |
Unrealized Losses | (138,498) |
Market Value | 26,525,181 |
Long-Term Investments [Member] | Government Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost |  | 5,519,668
Unrealized Gains |  | 661
Unrealized Losses |  | (9,539)
Market Value |  | 5,510,790
Long-Term Investments [Member] | Mutual Funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost |  | 27,329,164
Unrealized Gains |  | 1,830,992
Unrealized Losses |  | (288,146)
Market Value |  | 28,872,010
Long-Term Investments [Member] | Corporate Bond Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 3,034,367 | 1,955,292
Unrealized Gains | 4,183 | 0
Unrealized Losses | 0 | (6,736)
Market Value | 3,038,550 | 1,948,556
Long-Term Investments [Member] | Common Stocks [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 10,455,462 | 9,825,550
Unrealized Gains | 3,809,668 | 3,349,962
Unrealized Losses | (445,276) | (326,505)
Market Value | 13,819,854 | 12,849,007
Long-Term Investments [Member] | Mutual Funds – Equity [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 27,491,364 |
Unrealized Gains | 4,123,947 |
Unrealized Losses | 0 |
Market Value | 31,615,311 |
Long-Term Investments [Member] | Preferred Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cost | 745,462 | 745,462
Unrealized Gains | 41,204 | 360
Unrealized Losses | 0 | (31,822)
Market Value | 786,666 | 714,000
Fair Value, Inputs, Level 1 [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cash & Cash Equivalents | 580,579,352 | 546,477,075
Investments and Cash | 757,043,356 | 719,124,745
Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member] | Certificates of Deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value | 130,000,000 | 130,000,000
Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member] | Government Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member] | Mutual Funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member] | Corporate Bond Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Short-term Investments [Member] | Other Debt Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value | 242,173 | 212,653
Fair Value, Inputs, Level 1 [Member] | Long-Term Investments [Member] | Government Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value |  | 0
Fair Value, Inputs, Level 1 [Member] | Long-Term Investments [Member] | Mutual Funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value |  | 28,872,010
Fair Value, Inputs, Level 1 [Member] | Long-Term Investments [Member] | Corporate Bond Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value | 0 | 0
Fair Value, Inputs, Level 1 [Member] | Long-Term Investments [Member] | Common Stocks [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value | 13,819,854 | 12,849,007
Fair Value, Inputs, Level 1 [Member] | Long-Term Investments [Member] | Mutual Funds – Equity [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value | 31,615,311 |
Fair Value, Inputs, Level 1 [Member] | Long-Term Investments [Member] | Preferred Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value | 786,666 | 714,000
Fair Value, Inputs, Level 2 [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cash & Cash Equivalents | 0 | 0
Investments and Cash | 57,349,619 | 54,267,889
Fair Value, Inputs, Level 2 [Member] | Short-term Investments [Member] | Certificates of Deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Short-term Investments [Member] | Government Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value | 17,028,600 | 13,993,480
Fair Value, Inputs, Level 2 [Member] | Short-term Investments [Member] | Mutual Funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value | 26,525,181 | 26,116,681
Fair Value, Inputs, Level 2 [Member] | Short-term Investments [Member] | Corporate Bond Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value | 10,757,288 | 6,698,382
Fair Value, Inputs, Level 2 [Member] | Short-term Investments [Member] | Other Debt Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Long-Term Investments [Member] | Government Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value |  | 5,510,790
Fair Value, Inputs, Level 2 [Member] | Long-Term Investments [Member] | Mutual Funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value |  | 0
Fair Value, Inputs, Level 2 [Member] | Long-Term Investments [Member] | Corporate Bond Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value | 3,038,550 | 1,948,556
Fair Value, Inputs, Level 2 [Member] | Long-Term Investments [Member] | Common Stocks [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value | 0 | 0
Fair Value, Inputs, Level 2 [Member] | Long-Term Investments [Member] | Mutual Funds – Equity [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value | 0 |
Fair Value, Inputs, Level 2 [Member] | Long-Term Investments [Member] | Preferred Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value | 0 | 0
Fair Value, Inputs, Level 3 [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Cash & Cash Equivalents | 0 | 0
Investments and Cash | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Short-term Investments [Member] | Certificates of Deposit [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Short-term Investments [Member] | Government Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Short-term Investments [Member] | Mutual Funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Short-term Investments [Member] | Corporate Bond Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Short-term Investments [Member] | Other Debt Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Long-Term Investments [Member] | Government Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value |  | 0
Fair Value, Inputs, Level 3 [Member] | Long-Term Investments [Member] | Mutual Funds [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value |  | 0
Fair Value, Inputs, Level 3 [Member] | Long-Term Investments [Member] | Corporate Bond Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Long-Term Investments [Member] | Common Stocks [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value | 0 | 0
Fair Value, Inputs, Level 3 [Member] | Long-Term Investments [Member] | Mutual Funds – Equity [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value | 0 |
Fair Value, Inputs, Level 3 [Member] | Long-Term Investments [Member] | Preferred Stock [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Market Value | $ 0 | $ 0

X
- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. + References No definition available. + Details
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