Investments (Tables)

6 Months Ended

12 Months Ended

Jun. 30, 2011

Dec. 31, 2010

Investments

Investment Securities Stated At Fair Value

			Fair Value Measurements at Reporting Date Using
			Quoted Prices in
			Active Markets		Significant		Significant
			for Identical		Other Observable		Unobservable
	Total as of		Assets		Inputs		Inputs
Description	June 30, 2011		(Level 1)		(Level 2)		(Level 3)
Cash & Cash Equivalents	$	444,619,932	$	444,619,932	$	—	$	—
Short-Term Investments:
Government Securities		24,054,390		24,054,390		—		—
Other		62,413		62,413		—		—
Long-Term Investments:
Common Stocks		61,706,850		61,706,850		—		—
Mutual Funds – Equity		71,062,101		71,062,101		—		—
Limited Partnership – Equity		9,059,455		—		9,059,455		—
Certificate of Deposit		500,000		—		500,000		—
Other – Equity		356,400		356,400		—		—
Total	$	611,421,541	$	601,862,086	$	9,559,455	$	—

			Fair Value Measurements at Reporting Date Using
			Quoted Prices in
			Active Markets		Significant		Significant
			for Identical		Other Observable		Unobservable
	Total as of		Assets		Inputs		Inputs
Description	December 31, 2010		(Level 1)		(Level 2)		(Level 3)
Cash & Cash Equivalents	$	348,349,773	$	348,349,773	$	—	$	—
Short-Term Investments:
Government Securities		36,136,760		36,136,760		—		—
U.S. Treasury Notes		50,156,250		—		50,156,250		—
Other		154,586		154,586		—		—
Long-Term Investments:
Common Stocks		63,637,711		63,637,711		—		—
Mutual Funds – Equity		55,234,901		55,234,901		—		—
Limited Partnership – Equity		9,363,555		—		9,363,555		—
Certificate of Deposit		500,000		—		500,000		—
Other – Equity		355,000		355,000		—		—
Total	$	563,888,536	$	503,868,731	$	60,019,805	$	—

Unrealized Gain (Loss) On Investments

			Unrealized
As of June 30, 2011:	Cost		Gains		Losses			Market value
Short-Term Investments:
Government Securities	$	24,058,998	$	4,731	$	(9,339	)	$	24,054,390
Other		62,413		—		—			62,413
Long-Term Investments:
Common Stocks		45,309,491		16,660,519		(263,160	)		61,706,850
Mutual Funds-Equity		55,701,057		15,473,869		(112,825	)		71,062,101
Limited Partnership – Equity		7,779,258		1,280,197		—			9,059,455
Certificate of Deposit		500,000		—		—			500,000
Other – Equity		338,506		17,894		—			356,400
Total	$	133,749,723	$	33,437,210	$	(385,324	)	$	166,801,609

			Unrealized
As of December 31, 2010:	Cost		Gains		Losses			Market value
Short-Term Investments:
Government Securities	$	36,137,467	$	9,254	$	(9,961	)	$	36,136,760
U.S. Treasury Notes		50,095,921		60,329		—			50,156,250
Other		154,586		—		—			154,586
Long-Term Investments:
Common Stocks		44,899,944		18,819,518		(81,751	)		63,637,711
Mutual Funds-Equity		42,106,776		13,128,125		—			55,234,901
Limited Partnership – Equity		7,844,022		1,519,533		—			9,363,555
Certificate of Deposit		500,000		—		—			500,000
Other – Equity		338,506		16,494		—			355,000
Total	$	182,077,222	$	33,553,253	$	(91,712	)	$	215,538,763

Schedule of Unrealized Loss on Investments

	Aggregate Unrealized Losses			Aggregate Fair Value
Less than one year	$	(385,324	)	$	26,774,133
Greater than one year		—			—

	Aggregate Unrealized Losses			Aggregate Fair Value
Less than one year	$	(91,712	)	$	17,007,886
Greater than one year		—			—

Maturities Of Fixed Income Securities

Due within one year	$	24,116,803
Due between one and five years		500,000
Due over five years		—