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Shareholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018
Equity [Abstract] |  |
Summary of Changes in Shareholders' Equity | A summary of changes in shareholders’ equity for the three months ended June 30, 2019 is presented below:
|  | Common Stock |  | Additional Paid-In Capital |  | Retained Earnings |  | Treasury Stock |  | Deferred Compensation Trust |  | Deferred Compensation Liability |  | Total
Balance, March 31, 2019 |  | $ | 206 |  |  | $ | 1,899,100 |  |  | $ | 7,219,739 |  |  | $ | (7,220,269 | ) |  | $ | (16,912 | ) |  | $ | 16,912 |  |  | $ | 1,898,776 |
Net income |  | — |  |  | — |  |  | 210,209 |  |  | — |  |  | — |  |  | — |  |  | 210,209 |
Deferred compensation activity, net |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Purchase of common stock for treasury |  | — |  |  | — |  |  | — |  |  | (87,980 | ) |  | — |  |  | — |  |  | (87,980 | )
Equity-based compensation |  | — |  |  | 18,577 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 18,577 |
Proceeds from Options exercised |  | — |  |  | 79,857 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 79,857 |
Treasury stock issued upon option exercise and restricted share vesting |  | — |  |  | (35,378 | ) |  | — |  |  | 35,378 |  |  | — |  |  | — |  |  | — |
Balance, June 30, 2019 |  | $ | 206 |  |  | $ | 1,962,156 |  |  | $ | 7,429,948 |  |  | $ | (7,272,871 | ) |  | $ | (16,912 | ) |  | $ | 16,912 |  |  | $ | 2,119,439 |
A summary of changes in shareholders’ equity for the six months ended June 30, 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 |  | — |  |  | — |  |  | 398,615 |  |  | — |  |  | — |  |  | — |  |  | 398,615 |
Deferred compensation activity, net |  | — |  |  | — |  |  | — |  |  | — |  |  | 25 |  |  | (25 | ) |  | — |
Purchase of common stock for treasury |  | — |  |  | — |  |  | — |  |  | (304,479 | ) |  | — |  |  | — |  |  | (304,479 | )
Equity-based compensation |  | — |  |  | 37,910 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 37,910 |
Proceeds from Options exercised |  | — |  |  | 178,831 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 178,831 |
Treasury stock issued upon option exercise and restricted share vesting |  | — |  |  | (74,808 | ) |  | — |  |  | 74,808 |  |  | — |  |  | — |  |  | — |
Balance, June 30, 2019 |  | $ | 206 |  |  | $ | 1,962,156 |  |  | $ | 7,429,948 |  |  | $ | (7,272,871 | ) |  | $ | (16,912 | ) |  | $ | 16,912 |  |  | $ | 2,119,439 |
| A summary of changes in shareholders’ equity for the three months ended June 30, 2018 is presented below:
|  | Common Stock |  | Additional Paid-In Capital |  | Retained Earnings |  | Treasury Stock |  | Deferred Compensation Trust |  | Deferred Compensation Liability |  | Total
Balance, March 31, 2018 |  | $ | 206 |  |  | $ | 1,678,100 |  |  | $ | 6,400,185 |  |  | $ | (6,611,683 | ) |  | $ | (17,389 | ) |  | $ | 17,389 |  |  | $ | 1,466,808 |
Net income |  | — |  |  | — |  |  | 203,174 |  |  | — |  |  | — |  |  | — |  |  | 203,174 |
Deferred compensation activity, net |  | — |  |  | — |  |  | — |  |  | — |  |  | 241 |  |  | (241 | ) |  | — |
Purchase of common stock for treasury |  | — |  |  | — |  |  | — |  |  | (126,296 | ) |  | — |  |  | — |  |  | (126,296 | )
Equity-based compensation |  | — |  |  | 18,595 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 18,595 |
Proceeds from Options exercised |  | — |  |  | 45,290 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 45,290 |
Treasury stock issued upon option exercise and restricted share vesting |  | — |  |  | (20,289 | ) |  | — |  |  | 20,289 |  |  | — |  |  | — |  |  | — |
Balance, June 30, 2018 |  | $ | 206 |  |  | $ | 1,721,696 |  |  | $ | 6,603,359 |  |  | $ | (6,717,690 | ) |  | $ | (17,148 | ) |  | $ | 17,148 |  |  | $ | 1,607,571 |
A summary of changes in shareholders’ equity for the six months ended June 30, 2018 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 |
Shareholders' Equity | Shareholders’ Equity A summary of changes in shareholders’ equity for the three months ended June 30, 2019 is presented below:
|  | Common Stock |  | Additional Paid-In Capital |  | Retained Earnings |  | Treasury Stock |  | Deferred Compensation Trust |  | Deferred Compensation Liability |  | Total
Balance, March 31, 2019 |  | $ | 206 |  |  | $ | 1,899,100 |  |  | $ | 7,219,739 |  |  | $ | (7,220,269 | ) |  | $ | (16,912 | ) |  | $ | 16,912 |  |  | $ | 1,898,776 |
Net income |  | — |  |  | — |  |  | 210,209 |  |  | — |  |  | — |  |  | — |  |  | 210,209 |
Deferred compensation activity, net |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |  |  | — |
Purchase of common stock for treasury |  | — |  |  | — |  |  | — |  |  | (87,980 | ) |  | — |  |  | — |  |  | (87,980 | )
Equity-based compensation |  | — |  |  | 18,577 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 18,577 |
Proceeds from Options exercised |  | — |  |  | 79,857 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 79,857 |
Treasury stock issued upon option exercise and restricted share vesting |  | — |  |  | (35,378 | ) |  | — |  |  | 35,378 |  |  | — |  |  | — |  |  | — |
Balance, June 30, 2019 |  | $ | 206 |  |  | $ | 1,962,156 |  |  | $ | 7,429,948 |  |  | $ | (7,272,871 | ) |  | $ | (16,912 | ) |  | $ | 16,912 |  |  | $ | 2,119,439 |
A summary of changes in shareholders’ equity for the six months ended June 30, 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 |  | — |  |  | — |  |  | 398,615 |  |  | — |  |  | — |  |  | — |  |  | 398,615 |
Deferred compensation activity, net |  | — |  |  | — |  |  | — |  |  | — |  |  | 25 |  |  | (25 | ) |  | — |
Purchase of common stock for treasury |  | — |  |  | — |  |  | — |  |  | (304,479 | ) |  | — |  |  | — |  |  | (304,479 | )
Equity-based compensation |  | — |  |  | 37,910 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 37,910 |
Proceeds from Options exercised |  | — |  |  | 178,831 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 178,831 |
Treasury stock issued upon option exercise and restricted share vesting |  | — |  |  | (74,808 | ) |  | — |  |  | 74,808 |  |  | — |  |  | — |  |  | — |
Balance, June 30, 2019 |  | $ | 206 |  |  | $ | 1,962,156 |  |  | $ | 7,429,948 |  |  | $ | (7,272,871 | ) |  | $ | (16,912 | ) |  | $ | 16,912 |  |  | $ | 2,119,439 |
We repurchased approximately 30 and 112 shares of our common stock during the three and six months ended June 30, 2019, respectively. We settle Option exercises and vesting of RSUs by issuing shares of treasury stock. Approximately 82 and 177 shares were issued from the treasury account during the three and six months ended June 30, 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 acquired. A summary of changes in shareholders’ equity for the three months ended June 30, 2018 is presented below:
|  | Common Stock |  | Additional Paid-In Capital |  | Retained Earnings |  | Treasury Stock |  | Deferred Compensation Trust |  | Deferred Compensation Liability |  | Total
Balance, March 31, 2018 |  | $ | 206 |  |  | $ | 1,678,100 |  |  | $ | 6,400,185 |  |  | $ | (6,611,683 | ) |  | $ | (17,389 | ) |  | $ | 17,389 |  |  | $ | 1,466,808 |
Net income |  | — |  |  | — |  |  | 203,174 |  |  | — |  |  | — |  |  | — |  |  | 203,174 |
Deferred compensation activity, net |  | — |  |  | — |  |  | — |  |  | — |  |  | 241 |  |  | (241 | ) |  | — |
Purchase of common stock for treasury |  | — |  |  | — |  |  | — |  |  | (126,296 | ) |  | — |  |  | — |  |  | (126,296 | )
Equity-based compensation |  | — |  |  | 18,595 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 18,595 |
Proceeds from Options exercised |  | — |  |  | 45,290 |  |  | — |  |  | — |  |  | — |  |  | — |  |  | 45,290 |
Treasury stock issued upon option exercise and restricted share vesting |  | — |  |  | (20,289 | ) |  | — |  |  | 20,289 |  |  | — |  |  | — |  |  | — |
Balance, June 30, 2018 |  | $ | 206 |  |  | $ | 1,721,696 |  |  | $ | 6,603,359 |  |  | $ | (6,717,690 | ) |  | $ | (17,148 | ) |  | $ | 17,148 |  |  | $ | 1,607,571 |
A summary of changes in shareholders’ equity for the six months ended June 30, 2018 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 |
We repurchased approximately 42 and 158 shares of our common stock during the three and six months ended June 30, 2018, respectively. Approximately 52 and 96 shares were issued from the treasury account during the three and six months ended June 30, 2018, respectively, in settlement of Option exercises and vesting of RSUs. |

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- Definition Tabular disclosure of changes in the separate accounts comprising stockholders' equity (in addition to retained earnings) and of the changes in the number of shares of equity securities during at least the most recent annual fiscal period and any subsequent interim period presented is required to make the financial statements sufficiently informative if both financial position and results of operations are presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 + Details
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- Definition The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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