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Shareholders' Equity (Tables)
 9 Months Ended
Sep. 30, 2018
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, 2017
 
$
206

 
$
1,644,197

 
$
6,231,940

 
$
(6,270,851
)
 
$
(17,383
)
 
$
17,383

 
$
1,605,492

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Cumulative-effect adjustment from adoption of ASU 2014-09, net of tax
 
—

 
—

 
2,196

 
—

 
—

 
—

 
2,196

Net income
 
—

 
—

 
565,039

 
—

 
—

 
—

 
565,039

Deferred compensation activity, net
 
—

 
—

 
—

 
—

 
455

 
(455
)
 
—

Purchase of common stock for treasury
 
—

 
—

 
—

 
(657,369
)
 
—

 
—

 
(657,369
)
Equity-based compensation
 
—

 
51,690

 
—

 
—

 
—

 
—

 
51,690

Proceeds from Options exercised
 
—

 
115,268

 
—

 
—

 
—

 
—

 
115,268

Treasury stock issued upon option exercise and restricted share vesting
 
—

 
(48,832
)
 
—

 
48,832

 
—

 
—

 
—

Balance, September 30, 2018
 
$
206

 
$
1,762,323

 
$
6,799,175

 
$
(6,879,388
)
 
$
(16,928
)
 
$
16,928

 
$
1,682,316