Investments (Tables)

3 Months Ended

Mar. 31, 2015

Investments [Abstract]

Investment Securities Stated at Fair Value

Assets or liabilities that have recurring fair value measurements are shown below as of March 31, 2015, and December 31, 2014:

As of March 31, 2015:

			Fair Value Measurements at Reporting Date Using
	Total as of		Quoted Prices in Active Markets for Identical Assets		Significant  Other Observable Inputs		Significant Unobservable Inputs
Description	March 31, 2015		(Level 1)		(Level 2)		(Level 3)
Cash & Cash Equivalents	$	549,911,648	$	549,911,648	$	—	$	—
Short-Term Investments:
Other	560		560		—		—
Long-Term Investments:
Common Stocks	24,161,865		24,161,865		—		—
Mutual Funds – Equity	91,335,235		91,335,235		—		—
Total	$	665,409,308	$	665,409,308	$	—	$	—

As of December 31, 2014:

			Fair Value Measurements at Reporting Date Using
	Total as of		Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
Description	December 31, 2014		(Level 1)		(Level 2)		(Level 3)
Cash & Cash Equivalents	$	497,429,804	$	497,429,804	$	—	$	—
Short-Term Investments:
Other	1,021		1,021		—		—
Long-Term Investments:
Common Stocks	24,648,451		24,648,451		—		—
Mutual Funds – Equity	89,994,116		89,994,116		—		—
Total	$	612,073,392	$	612,073,392	$	—	$	—

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

The amortized cost, unrealized gains and losses, and market value of investment securities are shown as of March 31, 2015, and December 31, 2014:

As of March 31, 2015:

			Unrealized
	Cost		Gains		Losses			Market Value
Short-Term Investments:
Other	$	560	$	—	$	—		$	560
Long-Term Investments:
Common Stocks	18,804,767		5,825,050		(467,952		)	24,161,865
Mutual Funds – Equity	80,549,522		11,109,462		(323,749		)	91,335,235
Total	$	99,354,849	$	16,934,512	$	(791,701	)	$	115,497,660

As of December 31, 2014:

			Unrealized
	Cost		Gains		Losses			Market Value
Short-Term Investments:
Other	1,021		—		—			1,021
Long-Term Investments:
Common Stocks	$	17,069,742	$	7,933,717	$	(355,008	)	$	24,648,451
Mutual Funds – Equity	80,852,329		9,922,204		(780,417		)	89,994,116
Total	$	97,923,092	$	17,855,921	$	(1,135,425	)	$	114,643,588

Schedule of Unrealized Loss on Investments

Unrealized losses on investments as of March 31, 2015, are as follows:

	Aggregate Unrealized Losses		Aggregate Fair Value
Less than one year	$	791,701	$	15,894,733

Unrealized losses on investments as of December 31, 2014, are as follows:

	Aggregate Unrealized Losses		Aggregate Fair Value
Less than one year	$	1,135,425	$	19,972,258