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Shareholders' Equity (Tables)
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Equity [Abstract]    
Shareholders' Equity Shareholders’ Equity
A summary of changes in shareholders’ equity for the three months ended March 31, 2020 is presented below:
 Common
Stock
Additional
Paid-In
Capital
Retained
Earnings
Treasury
Stock
Deferred
Compensation
Trust
Deferred
Compensation
Liability
Total
Balance, December 31, 2019$206  $2,055,407  $7,909,872  $(7,624,241) $(16,912) $16,912  $2,341,244  
Net income—  —  175,703  —  —  —  175,703  
Purchase of common stock for treasury—  —  —  (216,582) —  —  (216,582) 
Equity-based compensation—  7,492  —  —  —  —  7,492  
Proceeds from Options exercised—  109,062  —  —  —  —  109,062  
Treasury stock issued upon option exercise and restricted share vesting—  (44,646) —  44,646  —  —  —  
Balance, March 31, 2020$206  $2,127,315  $8,085,575  $(7,796,177) $(16,912) $16,912  $2,416,919  
A summary of changes in shareholders’ equity for the three months ended March 31, 2019 is presented below:
 Common
Stock
Additional
Paid-In
Capital
Retained
Earnings
Treasury
Stock
Deferred
Compensation
Trust
Deferred
Compensation
Liability
Total
Balance, December 31, 2018$206  $1,820,223  $7,031,333  $(7,043,200) $(16,937) $16,937  $1,808,562  
Net income—  —  188,406  —  —  —  188,406  
Deferred compensation activity, net—  —  —  —  25  (25) —  
Purchase of common stock for treasury—  —  —  (216,499) —  —  (216,499) 
Equity-based compensation—  19,333  —  —  —  —  19,333  
Proceeds from Options exercised—  98,974  —  —  —  —  98,974  
Treasury stock issued upon option exercise and restricted share vesting—  (39,430) —  39,430  —  —  —  
Balance, March 31, 2019$206  $1,899,100  $7,219,739  $(7,220,269) $(16,912) $16,912  $1,898,776  

We repurchased approximately 58 and 82 shares of our common stock during the three months ended March 31, 2020 and 2019, respectively. We settle Option exercises and vesting of RSUs by issuing shares of treasury stock.  Approximately 99 and 95 shares were issued from the treasury account during the three months ended March 31, 2020 and 2019, respectively, in settlement of Option exercises and vesting of RSUs.  Shares are relieved from the treasury account based on the weighted average cost basis of treasury shares.
 
Summary of Changes in Shareholders' Equity
A summary of changes in shareholders’ equity for the three months ended March 31, 2020 is presented below:
 Common
Stock
Additional
Paid-In
Capital
Retained
Earnings
Treasury
Stock
Deferred
Compensation
Trust
Deferred
Compensation
Liability
Total
Balance, December 31, 2019$206  $2,055,407  $7,909,872  $(7,624,241) $(16,912) $16,912  $2,341,244  
Net income—  —  175,703  —  —  —  175,703  
Purchase of common stock for treasury—  —  —  (216,582) —  —  (216,582) 
Equity-based compensation—  7,492  —  —  —  —  7,492  
Proceeds from Options exercised—  109,062  —  —  —  —  109,062  
Treasury stock issued upon option exercise and restricted share vesting—  (44,646) —  44,646  —  —  —  
Balance, March 31, 2020$206  $2,127,315  $8,085,575  $(7,796,177) $(16,912) $16,912  $2,416,919  
A summary of changes in shareholders’ equity for the three months ended March 31, 2019 is presented below:
 Common
Stock
Additional
Paid-In
Capital
Retained
Earnings
Treasury
Stock
Deferred
Compensation
Trust
Deferred
Compensation
Liability
Total
Balance, December 31, 2018$206  $1,820,223  $7,031,333  $(7,043,200) $(16,937) $16,937  $1,808,562  
Net income—  —  188,406  —  —  —  188,406  
Deferred compensation activity, net—  —  —  —  25  (25) —  
Purchase of common stock for treasury—  —  —  (216,499) —  —  (216,499) 
Equity-based compensation—  19,333  —  —  —  —  19,333  
Proceeds from Options exercised—  98,974  —  —  —  —  98,974  
Treasury stock issued upon option exercise and restricted share vesting—  (39,430) —  39,430  —  —  —  
Balance, March 31, 2019$206  $1,899,100  $7,219,739  $(7,220,269) $(16,912) $16,912  $1,898,776