Summary of Significant Accounting and Reporting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Schedule of Allowance For Doubtful Accounts

The following table presents the activity in the Company’s allowance for doubtful accounts:



	Beginning Balance		Net Additions/ (Reductions) to Costs and Expenses		Deductions and Other Adjustments			Ending Balance
Year Ended December 31, 2017:
Allowance for Doubtful Accounts	$	2,917,424	$	—	$	(202,891	)	$	2,714,533
Year Ended December 31, 2016:
Allowance for Doubtful Accounts	$	2,663,477	$	—	$	253,947		$	2,917,424
Year Ended December 31, 2015:
Allowance for Doubtful Accounts	$	2,711,248	$	—	$	(47,771	)	$	2,663,477

Schedule of Assets or Liabilities Having Recurring Measurements

Assets or liabilities that have recurring fair value measurements are shown below as of December 31, 2017 and December 31, 2016:



			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, 2017		(Level I)		(Level 2)		(Level 3)
Cash & Cash Equivalents	$	569,734,496	$	569,734,496	$	—	$	—
Short-Term Investments:
Certificate of Deposit	130,000,000		130,000,000		—		—
Government Securities	9,011,130		—		9,011,130		—
Mutual Funds	393,581		—		393,581		—
Corporate Bonds	12,944,999		—		12,944,999		—
Other	188,344		188,344		—		—
Long-Term Investments:
Corporate Bonds	3,018,720		—		3,018,720		—
Common Stocks	15,703,371		15,703,371		—		—
Mutual Funds	34,681,337		34,681,337		—		—
Preferred Stock	1,178,991		1,178,991		—		—
Total	$	776,854,969	$	751,486,539	$	25,368,430	$	—



			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, 2016		(Level I)		(Level 2)		(Level 3)
Cash & Cash Equivalents	$	546,477,075	$	546,477,075	$	—	$	—
Short-Term Investments:
Certificate of Deposit	130,000,000		130,000,000		—		—
Government Securities	13,993,480		—		13,993,480		—
Mutual Funds	26,116,681		—		26,116,681		—
Corporate Bonds	6,698,382		—		6,698,382		—
Other	212,653		212,653		—		—
Long-Term Investments:
Corporate Bonds	1,948,556		—		1,948,556		—
Common Stocks	12,849,007		12,849,007		—		—
Mutual Funds	28,872,010		28,872,010		—		—
Preferred Stock	714,000		714,000		—		—
Government Securities	5,510,790		—		5,510,790		—
Total	$	773,392,634	$	719,124,745	$	54,267,889	$	—

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 December 31, 2017 and 2016:



	Unrealized
2017	Cost		Gains		Losses			Market Value
Short-Term Investments:
Certificate of Deposit	$	130,000,000	$	—	$	—		$	130,000,000
Government Securities	9,024,777		—		(13,647		)	9,011,130
Mutual Funds	392,482		1,575		(476		)	393,581
Corporate Bonds	12,952,229		—		(7,230		)	12,944,999
Other	188,344		—		—			188,344
Long-Term Investments:
Corporate Bonds	3,022,994		—		(4,274		)	3,018,720
Common Stocks	10,897,219		5,079,815		(273,663		)	15,703,371
Mutual Funds	29,306,540		5,440,344		(65,547		)	34,681,337
Preferred Stock	1,141,458		40,533		(3,000		)	1,178,991
Total	$	196,926,043	$	10,562,267	$	(367,837	)	$	207,120,473



	Unrealized
2016	Cost		Gains		Losses			Market Value
Short-Term Investments:
Certificate of Deposit	$	130,000,000	$	—	$	—		$	130,000,000
Government Securities	14,003,644		—		(10,164		)	13,993,480
Mutual Funds	26,326,674		27,459		(237,452		)	26,116,681
Corporate Bonds	6,706,721		—		(8,339		)	6,698,382
Other	212,653		—		—			212,653
Long-Term Investments:
Corporate Bonds	1,955,292		—		(6,736		)	1,948,556
Common Stocks	9,825,550		3,349,962		(326,505		)	12,849,007
Mutual Funds	27,329,164		1,830,992		(288,146		)	28,872,010
Preferred Stock	745,462		360		(31,822		)	714,000
Government Securities	5,519,668		661		(9,539		)	5,510,790
Total	$	222,624,828	$	5,209,434	$	(918,703	)	$	226,915,559

Schedule of Unrealized Losses on Investments

Unrealized losses on investments as of December 31, 2017 are as follows:



	Aggregate Unrealized Losses		Aggregate Fair Value
Less than one year	$	263,655	$	31,223,557
Greater than one year	104,182		285,077
Total	$	367,837	$	31,508,634

Unrealized losses on investments as of December 31, 2016 are as follows:



	Aggregate Unrealized Losses		Aggregate Fair Value
Less than one year	$	767,612	$	55,574,292
Greater than one year	151,091		358,120
Total	$	918,703	$	55,932,412

Investments Classified by Contractual Maturity Date

Fixed income securities as of December 31, 2017, have contractual maturities as follows:



Due within one year	$	151,956,129
Due between one and five years	4,197,711
Due over five years	—
	$	156,153,840

Schedule of Inventories

Inventories consisted of the following as of December 31, 2017 and 2016:



	2017		2016
Raw materials	$	139,272,129	$	115,099,569
Work-in-process	30,481,192		32,509,368
Finished goods	47,012,262		41,702,500
Total Inventory	$	216,765,583	$	189,311,437

Schedule of Earnings Per Share Basic and Diluted

The following table reconciles the numerators and denominators used in the calculations of basic and diluted earnings per share (EPS) for each of the last three years:



	2017		2016		2015
Numerators:
Numerator for both basic and diluted EPS, net income	$	406,791,922	$	347,591,276	$	318,469,859
Denominators:
Denominator for basic EPS, weighted-average common shares outstanding	285,864,997		288,433,772		293,096,212
Potentially dilutive shares resulting from stock option plans	2,361,092		2,638,544		3,141,687
Denominator for diluted EPS	288,226,089		291,072,316		296,237,899