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Summary of Significant Accounting and Reporting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
Accounting Policies [Abstract]  
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, 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

Year Ended December 31, 2014:
 
 
 
 
 
 
 
Allowance for Doubtful Accounts
$
3,202,388

 
$
(300,000
)
 
$
(191,140
)
 
$
2,711,248
Schedule of Assets or Liabilities Having Recurring Measurements
Assets or liabilities that have recurring fair value measurements are shown below as of December 31, 2016 and December 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
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

 
$
—


 
 
 
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, 2015
 
(Level I)
 
(Level 2)
 
(Level 3)
Cash & Cash Equivalents
$
551,557,527

 
$
551,557,527

 
$
—

 
$
—

Short-Term Investments:
 
 
 
 
 
 
 
Government Securities
3,010,860

 
—

 
3,010,860

 
—

Corporate Bonds
1,512,015

 
—

 
1,512,015

 
—

Other
24,480

 
24,480

 
—

 
—

Long-Term Investments:
 
 
 
 
 
 
 
Common Stocks
20,454,804

 
20,454,804

 
—

 
—

Mutual Funds – Equity
74,701,735

 
74,701,735

 
—

 
—

Total
$
651,261,421

 
$
646,738,546

 
$
4,522,875

 
$
—
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, 2016 and 2015:
 
 
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


 
Unrealized
2015
Cost
 
Gains
 
Losses
 
Market Value
Short-Term Investments:
 
 
 
 
 
 
 
Government Securities
$
3,013,482

 
$
—

 
$
(2,622
)
 
$
3,010,860

Corporate Bonds
1,512,405

 
—

 
(390
)
 
1,512,015

Other
24,480

 
—

 
—

 
24,480

Long-Term Investments:
 
 
 
 
 
 
 
Common Stocks
17,395,641

 
4,078,912

 
(1,019,749
)
 
20,454,804

Mutual Funds-Equity
76,481,106

 
2,067,399

 
(3,846,770
)
 
74,701,735

Total
$
98,427,114

 
$
6,146,311

 
$
(4,869,531
)
 
$
99,703,894
Schedule of Unrealized Losses on Investments
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


Unrealized losses on investments as of December 31, 2015 are as follows:
 
 
Aggregate Unrealized Losses
 
Aggregate Fair Value
Less than one year
$
4,869,531

 
$
65,440,181

Greater than one year
—

 
—

       Total
$
4,869,531

 
$
65,440,181
Schedule of Inventories
Inventories consisted of the following as of December 31, 2016 and 2015:
 
 
2016
 
2015
Raw materials
$
115,099,569

 
$
110,683,958

Work-in-process
32,509,368

 
27,077,220

Finished goods
41,702,500

 
36,934,233

Total Inventory
$
189,311,437

 
$
174,695,411
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 adjusted for the two-for-one common stock split effected in the form of a 100% stock dividend issued on December 31, 2014:
 
2016
 
2015
 
2014
Numerators:
 
 
 
 
 
Numerator for both basic and diluted EPS, net income
$
347,591,276

 
$
318,469,859

 
$
288,604,579

Denominators:
 
 
 
 
 
Denominator for basic EPS, weighted-average common shares outstanding
288,433,772

 
293,096,212

 
290,952,123

Potentially dilutive shares resulting from stock option plans
2,638,544

 
3,141,687

 
3,347,236

Denominator for diluted EPS
291,072,316

 
296,237,899

 
294,299,359