Investments (Available-For-Sale Investment Securities At Fair Value) (Details) (USD $)	Jun. 30, 2011	Dec. 31, 2010
Cash & Cash Equivalents	$ 444,619,932	$ 348,349,773
Total	611,421,541	563,888,536
Government Securities [Member]
Investments	24,054,390	36,136,760
Government Securities [Member] \| Fair Value, Inputs, Level 1 [Member]
Investments	24,054,390	36,136,760
Government Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Investments
Government Securities [Member] \| Fair Value, Inputs, Level 3 [Member]
Investments
U.S. Treasury Notes [Member]
Investments		50,156,250
U.S. Treasury Notes [Member] \| Fair Value, Inputs, Level 1 [Member]
Investments
U.S. Treasury Notes [Member] \| Fair Value, Inputs, Level 2 [Member]
Investments		50,156,250
U.S. Treasury Notes [Member] \| Fair Value, Inputs, Level 3 [Member]
Investments
Other [Member]
Investments	62,413	154,586
Other [Member] \| Fair Value, Inputs, Level 1 [Member]
Investments	62,413	154,586
Other [Member] \| Fair Value, Inputs, Level 2 [Member]
Investments
Other [Member] \| Fair Value, Inputs, Level 3 [Member]
Investments
Common Stocks [Member]
Investments	61,706,850	63,637,711
Common Stocks [Member] \| Fair Value, Inputs, Level 1 [Member]
Investments	61,706,850	63,637,711
Common Stocks [Member] \| Fair Value, Inputs, Level 2 [Member]
Investments
Common Stocks [Member] \| Fair Value, Inputs, Level 3 [Member]
Investments
Mutual Funds - Equity [Member]
Investments	71,062,101	55,234,901
Mutual Funds - Equity [Member] \| Fair Value, Inputs, Level 1 [Member]
Investments	71,062,101	55,234,901
Mutual Funds - Equity [Member] \| Fair Value, Inputs, Level 2 [Member]
Investments
Mutual Funds - Equity [Member] \| Fair Value, Inputs, Level 3 [Member]
Investments
Limited Partnership - Equity [Member]
Investments	9,059,455	9,363,555
Limited Partnership - Equity [Member] \| Fair Value, Inputs, Level 1 [Member]
Investments
Limited Partnership - Equity [Member] \| Fair Value, Inputs, Level 2 [Member]
Investments	9,059,455	9,363,555
Limited Partnership - Equity [Member] \| Fair Value, Inputs, Level 3 [Member]
Investments
Certificate Of Deposit [Member]
Investments	500,000	500,000
Certificate Of Deposit [Member] \| Fair Value, Inputs, Level 1 [Member]
Investments
Certificate Of Deposit [Member] \| Fair Value, Inputs, Level 2 [Member]
Investments	500,000	500,000
Certificate Of Deposit [Member] \| Fair Value, Inputs, Level 3 [Member]
Investments
Other - Equity [Member]
Investments	356,400	355,000
Other - Equity [Member] \| Fair Value, Inputs, Level 1 [Member]
Investments	356,400	355,000
Other - Equity [Member] \| Fair Value, Inputs, Level 2 [Member]
Investments
Other - Equity [Member] \| Fair Value, Inputs, Level 3 [Member]
Investments
Fair Value, Inputs, Level 1 [Member]
Cash & Cash Equivalents	444,619,932	348,349,773
Total	601,862,086	503,868,731
Fair Value, Inputs, Level 2 [Member]
Cash & Cash Equivalents
Total	9,559,455	60,019,805
Fair Value, Inputs, Level 3 [Member]
Cash & Cash Equivalents
Total

For an unclassified balance sheet, this item represents investments in debt and equity securities which are categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6871852&loc=d3e26610-111562

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph b
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 15E
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 22
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 15D
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 13
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name FASB Staff Position (FSP)
-Number FAS115-1/124-1
-Paragraph 15C
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 14
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 16
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6379932&loc=d3e22054-111558

+ Details

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

+ References+ Details

- Definition

+ References+ Details