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Investments (Schedule Of Amortized Cost, Unrealized Gains And Losses, And Market Value Of Investment Securities) (Details) (USD $)	Sep. 30, 2011	Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Unrealized Gains	$ 14,467,786	$ 33,553,253
Unrealized Losses	(6,515,618)	(91,712)
Cost [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments	158,109,068	182,077,222
Cost [Member] \| Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments	59,062,836	36,137,467
Cost [Member] \| U.S. Treasury Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments		50,095,921
Cost [Member] \| Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments	73,748	154,586
Cost [Member] \| Common Stocks [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments	43,474,434	44,899,944
Cost [Member] \| Mutual Funds - Equity [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments	54,654,154	42,106,776
Cost [Member] \| Limited Partnership - Equity
Schedule of Available-for-sale Securities [Line Items]
Investments		7,844,022
Cost [Member] \| Certificate Of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments	505,390	500,000
Cost [Member] \| Other - Equity [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments	338,506	338,506
Government Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments	59,071,590	36,136,760
Unrealized Gains	12,428	9,254
Unrealized Losses	(3,674)	(9,961)
U.S. Treasury Notes [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments		50,156,250
Unrealized Gains		60,329
Unrealized Losses
Other [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments	73,748	154,586
Unrealized Gains
Unrealized Losses
Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments	166,061,236	215,538,763
Common Stocks [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments	50,993,855	63,637,711
Unrealized Gains	10,410,611	18,819,518
Unrealized Losses	(2,891,190)	(81,751)
Mutual Funds - Equity [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments	55,060,953	55,234,901
Unrealized Gains	4,027,553	13,128,125
Unrealized Losses	(3,620,754)
Limited Partnership - Equity
Schedule of Available-for-sale Securities [Line Items]
Investments		9,363,555
Unrealized Gains		1,519,533
Unrealized Losses
Certificate Of Deposit [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments	505,390	500,000
Unrealized Gains
Unrealized Losses
Other - Equity [Member]
Schedule of Available-for-sale Securities [Line Items]
Investments	355,700	355,000
Unrealized Gains	17,194	16,494
Unrealized Losses

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 represents investment securities as of the balance sheet date which may include marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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