Investments (Tables)

9 Months Ended

Sep. 30, 2015

Investments [Abstract]

Investment Securities Stated at Fair Value

Assets or liabilities that have recurring fair value measurements are shown below as of September 30, 2015, and December 31, 2014:

As of September 30, 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	September 30, 2015		(Level 1)		(Level 2)		(Level 3)
Cash & Cash Equivalents	$	564,528,197	$	564,528,197	$	—	$	—
Short-Term Investments:
Other	335		335		—		—
Long-Term Investments:
Common Stocks	24,128,497		24,128,497		—		—
Mutual Funds – Equity	70,296,089		70,296,089		—		—
Total	$	658,953,118	$	658,953,118	$	—	$	—

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 September 30, 2015, and December 31, 2014:

As of September 30, 2015:

			Unrealized
	Cost		Gains		Losses			Market Value
Short-Term Investments:
Other	$	335	$	—	$	—		$	335
Long-Term Investments:
Common Stocks	21,181,972		4,667,521		(1,720,996		)	24,128,497
Mutual Funds – Equity	71,895,080		1,917,534		(3,516,525		)	70,296,089
Total	$	93,077,387	$	6,585,055	$	(5,237,521	)	$	94,424,921

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 September 30, 2015, are as follows:

	Aggregate Unrealized Losses		Aggregate Fair Value
Less than one year	$	5,237,521	$	58,061,443

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