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Shareholders' Equity
 9 Months Ended
Sep. 30, 2017
Equity [Abstract]  
Shareholders' Equity
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


The Company repurchased 110 shares of its common stock during the nine months ended September 30, 2017. The Company settles stock option exercises and vesting of restricted share units by issuing shares of treasury stock.  Approximately 153 shares were issued from the treasury account during the nine months ended September 30, 2017 in settlement of stock option exercises and vesting of restricted share units.  Shares are relieved from the treasury account based on the weighted average cost basis of treasury shares acquired.