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Shareholders' Equity (Tables)
 6 Months Ended
Jun. 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
 
—

 
—

 
369,223

 
—

 
—

 
—

 
369,223

Deferred compensation activity, net
 
—

 
—

 
—

 
—

 
235

 
(235
)
 
—

Purchase of common stock for treasury
 
—

 
—

 
—

 
(483,538
)
 
—

 
—

 
(483,538
)
Equity-based compensation
 
—

 
28,104

 
—

 
—

 
—

 
—

 
28,104

Proceeds from Options exercised
 
—

 
86,094

 
—

 
—

 
—

 
—

 
86,094

Treasury stock issued upon option exercise and restricted share vesting
 
—

 
(36,699
)
 
—

 
36,699

 
—

 
—

 
—

Balance, June 30, 2018
 
$
206

 
$
1,721,696

 
$
6,603,359

 
$
(6,717,690
)
 
$
(17,148
)
 
$
17,148

 
$
1,607,571