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 | | — |
| | — |
| | 166,049 |
| | — |
| | — |
| | — |
| | 166,049 |
| Deferred compensation activity | | — |
| | — |
| | — |
| | — |
| | (6 | ) | | 6 |
| | — |
| Purchase of common stock for treasury | | — |
| | — |
| | — |
| | (357,242 | ) | | — |
| | — |
| | (357,242 | ) | Equity-based compensation | | — |
| | 9,509 |
| | — |
| | — |
| | — |
| | — |
| | 9,509 |
| Proceeds from stock options exercised | | — |
| | 40,804 |
| | — |
| | — |
| | — |
| | — |
| | 40,804 |
| Treasury stock issued upon option exercise and restricted share vesting | | — |
| | (16,410 | ) | | — |
| | 16,410 |
| | — |
| | — |
| | — |
| Balance, March 31, 2018 | | $ | 206 |
| | $ | 1,678,100 |
| | $ | 6,400,185 |
| | $ | (6,611,683 | ) | | $ | (17,389 | ) | | $ | 17,389 |
| | $ | 1,466,808 |
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