Investments (Tables)

3 Months Ended

Mar. 31, 2012

Investments [Abstract]

Investment Securities Stated At Fair Value

			Fair Value Measurements at Reporting Date Using
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
Description	Total as of March 31, 2012		(Level 1)		(Level 2)		(Level 3)
Cash & Cash Equivalents	$	370,804,725	$	370,804,725	$	—	$	—
Short-Term Investments:
Government Securities		21,006,150		21,006,150		—		—
U.S. Treasury Notes		25,022,500		—		25,022,500		—
Corporate Bonds		5,730,158		—		5,730,158		—
Other		231,128		231,128		—		—
Long-Term Investments:
Common Stocks		61,462,560		61,462,560		—		—
Mutual Funds – Equity		81,167,814		81,167,814		—		—
Certificate of Deposit		505,390		—		505,390		—
Corporate Bonds		2,665,700		—		2,665,700		—
Other – Equity		353,900		353,900		—		—
Total	$	568,950,025	$	535,026,277	$	33,923,748	$	—
			Fair Value Measurements at Reporting Date Using
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
Description	Total as of December 31, 2011		(Level 1)		(Level 2)		(Level 3)
Cash & Cash Equivalents	$	357,986,774	$	357,986,774	$	—	$	—
Short-Term Investments:
Government Securities		35,024,030		35,024,030		—		—
U.S. Treasury Notes		25,044,000		—		25,044,000		—
Corporate Bonds		649,204		—		649,204		—
Other		91,003		91,003		—		—
Long-Term Investments:
Common Stocks		53,554,303		53,554,303		—		—
Mutual Funds – Equity		73,749,772		73,749,772		—		—
Certificate of Deposit		505,390		—		505,390		—
Other – Equity		358,700		358,700		—		—
Total	$	546,963,176	$	520,764,582	$	26,198,594	$	—

Schedule Of Amortized Cost, Unrealized Gains And Losses, And Market Value Of Investment Securities

As of March 31, 2012:			Unrealized
	Cost		Gains		Losses			Market value
Short-Term Investments:
Government Securities	$	21,003,435	$	2,888	($	173	)	$	21,006,150
U.S. Treasury Notes		25,016,013		6,487		—			25,022,500
Corporate Bonds		5,757,164		—		(27,006	)		5,730,158
Other		231,128		—		—			231,128
Long-Term Investments:
Common Stocks		44,007,773		17,691,650		(236,863	)		61,462,560
Mutual Funds-Equity		69,076,447		12,210,061		(118,694	)		81,167,814
Certificate of Deposit		505,390		—		—			505,390
Corporate Bonds		2,676,474		—		(10,774	)		2,665,700
Other—Equity		338,506		15,394		—			353,900
Total	$	168,612,330	$	29,926,480	($	393,510	)	$	198,145,300
As of December 31, 2011:			Unrealized
	Cost		Gains		Losses			Market value
Short-Term Investments:
Government Securities	$	35,016,980	$	7,090	($	40	)	$	35,024,030
U.S. Treasury Notes		25,025,600		18,400		—			25,044,000
Corporate Bonds		648,879		325		—			649,204
Other		91,003		—		—			91,003
Long-Term Investments:
Common Stocks		42,344,526		12,274,640		(1,064,863	)		53,554,303
Mutual Funds-Equity		68,986,676		6,277,183		(1,514,087	)		73,749,772
Certificate of Deposit		505,390		—		—			505,390
Other – Equity		338,506		20,194		—			358,700
Total	$	172,957,560	$	18,597,832	($	2,578,990	)	$	188,976,402

Schedule Of Unrealized Loss On Investments

Unrealized losses on investments as of March 31, 2012, are as follows:

	Aggregate Unrealized Losses			Aggregate Fair Value
Less than one year	($	393,510	)	$	19,619,288
Greater than one year		—			—

Unrealized losses on investments as of December 31, 2011, are as follows:

	Aggregate Unrealized Losses			Aggregate Fair Value
Less than one year	($	2,578,990	)	$	42,845,635
Greater than one year		—			—

Maturities Of Fixed Income Securities

Due within one year	$	51,989,936
Due between one and five years		3,171,090
Due over five years		—
	$	55,161,026