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Shareholders' Equity
 6 Months Ended
Jun. 30, 2023
Equity [Abstract]  
Shareholders' Equity Shareholders’ EquityA summary of changes in shareholders’ equity for the three months ended June 30, 2023 is presented below:
 Common
Stock		Additional
Paid-In
Capital		Retained
Earnings		Treasury
Stock		Deferred
Compensation
Trust		Deferred
Compensation
Liability		Total
Balance, March 31, 2023$206 $2,676,641 $12,117,766 $(10,949,267)$(16,710)$16,710 $3,845,346 
Net income— — 404,027 — — — 404,027 
Purchase of common stock for treasury— — — (201,077)— — (201,077)
Equity-based compensation— 25,159 — — — — 25,159 
Proceeds from Options exercised— 79,808 — — — — 79,808 
Treasury stock issued upon Option exercise — (33,921)— 33,921 — — — 
Balance, June 30, 2023$206 $2,747,687 $12,521,793 $(11,116,423)$(16,710)$16,710 $4,153,263 
A summary of changes in shareholders’ equity for the six months ended June 30, 2023 is presented below:
 Common
Stock		Additional
Paid-In
Capital		Retained
Earnings		Treasury
Stock		Deferred
Compensation
Trust		Deferred
Compensation
Liability		Total
Balance, December 31, 2022$206 $2,600,014 $11,773,414 $(10,866,785)$(16,710)$16,710 $3,506,849 
Net income— — 748,379 — — — 748,379 
Purchase of common stock for treasury— — — (311,125)— — (311,125)
Equity-based compensation— 47,436 — — — — 47,436 
Proceeds from Options exercised— 161,724 — — — — 161,724 
Treasury stock issued upon Option exercise and RSU vesting— (61,487)— 61,487 — — — 
Balance, June 30, 2023$206 $2,747,687 $12,521,793 $(11,116,423)$(16,710)$16,710 $4,153,263 

We repurchased 34,827 and 56,001 shares of our outstanding common stock during the three and six months ended June 30, 2023, respectively. We settle Option exercises and vesting of RSUs by issuing shares of treasury stock. We issued 53,615 and 97,556 shares from the treasury account during the three and six months ended June 30, 2023, 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.
A summary of changes in shareholders’ equity for the three months ended June 30, 2022 is presented below:
 Common
Stock		Additional
Paid-In
Capital		Retained
Earnings		Treasury
Stock		Deferred
Compensation
Trust		Deferred
Compensation
Liability		Total
Balance, March 31, 2022$206 $2,416,660 $10,473,939 $(10,165,206)$(16,710)$16,710 $2,725,599 
Net income— — 433,314 — — — 433,314 
Purchase of common stock for treasury— — — (266,915)— — (266,915)
Equity-based compensation— 20,087 — — — — 20,087 
Proceeds from Options exercised— 79,581 — — — — 79,581 
Treasury stock issued upon Option exercise — (18,205)— 18,205 — — — 
Balance, June 30, 2022$206 $2,498,123 $10,907,253 $(10,413,916)$(16,710)$16,710 $2,991,666 
A summary of changes in shareholders’ equity for the six months ended June 30, 2022 is presented below:
 Common
Stock		Additional
Paid-In
Capital		Retained
Earnings		Treasury
Stock		Deferred
Compensation
Trust		Deferred
Compensation
Liability		Total
Balance, December 31, 2021$206 $2,378,191 $10,047,839 $(9,423,858)$(16,710)$16,710 $3,002,378 
Net income— — 859,414 — — — 859,414 
Purchase of common stock for treasury— — — (1,015,703)— — (1,015,703)
Equity-based compensation— 31,755 — — — — 31,755 
Proceeds from Options exercised— 113,822 — — — — 113,822 
Treasury stock issued upon Option exercise — (25,645)— 25,645 — — — 
Balance, June 30, 2022$206 $2,498,123 $10,907,253 $(10,413,916)$(16,710)$16,710 $2,991,666 
We repurchased 61,078 and 207,132 shares of our outstanding common stock during the three and six months ended June 30, 2022, respectively. We issued 30,396 and 43,719 shares from the treasury account during the three and six months ended June 30, 2022, respectively, in settlement of Option exercises.