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Shareholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2017
Equity [Abstract]  
Summary of Changes in Shareholders' Equity
A summary of changes in shareholders’ equity is presented below:
 
 
Common
Stock
 
Additional
Paid-In
Capital
 
Retained
Earnings
 
Treasury
Stock
 
Deferred
Compensation
Trust
 
Deferred
Compensation
Liability
 
Total
Balance, December 31, 2016
 
$
206

 
$
1,515,828

 
$
5,695,376

 
$
(5,906,969
)
 
$
(17,375
)
 
$
17,375

 
$
1,304,441

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cumulative-effect adjustment from adoption of ASU 2016-09, net of tax
 
—

 
1,566

 
(957
)
 
—

 
—

 
—

 
609

Net income
 
—

 
—

 
412,902

 
—

 
—

 
—

 
412,902

Deferred compensation activity
 
—

 
—

 
—

 
—

 
(1
)
 
1

 
—

Purchase of common stock for treasury
 
—

 
—

 
—

 
(230,199
)
 
—

 
—

 
(230,199
)
Equity-based compensation
 
—

 
32,678

 
—

 
—

 
—

 
—

 
32,678

Proceeds from stock options exercised
 
—

 
130,245

 
—

 
—

 
—

 
—

 
130,245

Treasury stock issued upon option exercise and restricted share vesting
 
—

 
(54,205
)
 
—

 
54,205

 
—

 
—

 
—

Balance, September 30, 2017
 
$
206

 
$
1,626,112

 
$
6,107,321

 
$
(6,082,963
)
 
$
(17,376
)
 
$
17,376

 
$
1,650,676