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Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Adjustment to adopt credit-loss guidance | [1] | Cumulative Effect, Period of Adoption, Adjusted Balance | Common Stock | Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance | Additional Paid-in Capital | Additional Paid-in Capital Cumulative Effect, Period of Adoption, Adjusted Balance | Accumulated Other Comprehensive Income, net of taxes | Accumulated Other Comprehensive Income, net of taxes Cumulative Effect, Period of Adoption, Adjusted Balance | Retained Earnings | Retained Earnings Adjustment to adopt credit-loss guidance | [1] | Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance | Treasury Stock | Treasury Stock Cumulative Effect, Period of Adoption, Adjusted Balance
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2017 |  |  |  | 74,960 |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2017 | $ 399,952 |  |  | $ 750 |  | $ 244,363 |  | $ 837 |  | $ 163,860 |  |  | $ (9,858) |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income for the period | 83,524 |  |  |  |  |  |  |  |  | 83,524 |  |  |  |
Unrealized loss on available-for-sale marketable securities, net of taxes | (679) |  |  |  |  |  |  | (679) |  |  |  |  |  |
Total comprehensive income | 82,845 |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options and other stock-based compensation, net of shares tendered for payment (in shares) |  |  |  | 380 |  |  |  |  |  |  |  |  |  |
Exercise of stock options and other share-based compensation, net of shares tendered for payment | 8,517 |  |  | $ 3 |  | 8,514 |  |  |  |  |  |  |  |
Share-based expense | 5,580 |  |  |  |  | 5,580 |  |  |  |  |  |  |  |
Treasury shares issued for Deferred Compensation Plan funding | 354 |  |  |  |  | 519 |  |  |  |  |  |  | (165) |
Shares issued pursuant to Employee Stock Plan | 2,821 |  |  |  |  | 2,475 |  |  |  |  |  |  | 346 |
Dividends paid and accrued | (57,361) |  |  |  |  |  |  |  |  | (57,361) |  |  |  |
Shares issued pursuant to Dividend Reinvestment Plan | 89 |  |  |  |  | 75 |  |  |  |  |  |  | 14 |
Contingent shares settled pursuant to acquisition | (2,291) |  |  |  |  | (2,291) |  |  |  |  |  |  |  |
Other (in shares) |  |  |  | 4 |  |  |  |  |  |  |  |  |  |
Other | 274 |  |  |  |  | 205 |  |  |  | 69 |  |  |  |
Balance (in shares) at Dec. 31, 2018 |  |  |  | 75,344 |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2018 | 440,780 |  |  | $ 753 |  | 259,440 |  | 158 |  | 190,092 |  |  | (9,663) |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income for the period | 64,581 |  |  |  |  |  |  |  |  | 64,581 |  |  |  |
Unrealized loss on available-for-sale marketable securities, net of taxes | 2,761 |  |  |  |  |  |  | 2,761 |  |  |  |  |  |
Total comprehensive income | 67,342 |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options and other stock-based compensation, net of shares tendered for payment (in shares) |  |  |  | 207 |  |  |  |  |  |  |  |  |  |
Exercise of stock options and other share-based compensation, net of shares tendered for payment | 3,628 |  |  | $ 3 |  | 3,625 |  |  |  |  |  |  |  |
Payment of statutory withholding on issuance of restricted stock and restricted stock units | (587) |  |  |  |  | (587) |  |  |  |  |  |  |  |
Share-based expense | 6,590 |  |  |  |  | 6,590 |  |  |  |  |  |  |  |
Treasury shares issued for Deferred Compensation Plan funding | 388 |  |  |  |  | 535 |  |  |  |  |  |  | (147) |
Shares issued pursuant to Employee Stock Plan | 2,130 |  |  |  |  | 1,781 |  |  |  |  |  |  | 349 |
Dividends paid and accrued | (59,218) |  |  |  |  |  |  |  |  | (59,218) |  |  |  |
Shares issued pursuant to Dividend Reinvestment Plan | 90 |  |  |  |  | 68 |  |  |  |  |  |  | 22 |
Contingent shares settled pursuant to acquisition | (1,012) |  |  |  |  | (1,012) |  |  |  |  |  |  |  |
Other (in shares) |  |  |  | 6 |  |  |  |  |  |  |  |  |  |
Other | 174 |  |  |  |  | 174 |  |  |  |  |  |  |  |
Balance (in shares) at Dec. 31, 2019 |  |  |  | 75,557 | 75,557 |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2019 | $ 460,305 | $ (32,099) | $ 428,206 | $ 756 | $ 756 | 270,614 | $ 270,614 | 2,919 | $ 2,919 | 195,455 | $ (32,099) | $ 163,356 | (9,439) | $ (9,439)
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |  |  |  |  |  |  |  |
Net income for the period | $ 98,682 |  |  |  |  |  |  |  |  | 98,682 |  |  |  |
Unrealized loss on available-for-sale marketable securities, net of taxes | 2,644 |  |  |  |  |  |  | 2,644 |  |  |  |  |  |
Total comprehensive income | 101,326 |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options and other stock-based compensation, net of shares tendered for payment (in shares) |  |  |  | 235 |  |  |  |  |  |  |  |  |  |
Exercise of stock options and other share-based compensation, net of shares tendered for payment | 2,920 |  |  | $ 2 |  | 2,918 |  |  |  |  |  |  |  |
Payment of statutory withholding on issuance of restricted stock and restricted stock units | (675) |  |  |  |  | (675) |  |  |  |  |  |  |  |
Share-based expense | 7,329 |  |  |  |  | 7,329 |  |  |  |  |  |  |  |
Treasury shares issued for Deferred Compensation Plan funding | 385 |  |  |  |  | 438 |  |  |  |  |  |  | (53) |
Shares issued pursuant to Employee Stock Plan | 1,835 |  |  |  |  | 1,329 |  |  |  |  |  |  | 506 |
Dividends paid and accrued | (61,145) |  |  |  |  |  |  |  |  | (61,145) |  |  |  |
Shares issued pursuant to Dividend Reinvestment Plan | 93 |  |  |  |  | 66 |  |  |  |  |  |  | 27 |
Other (in shares) |  |  |  | 6 |  |  |  |  |  |  |  |  |  |
Other | 187 |  |  |  |  | 187 |  |  |  |  |  |  |  |
Balance (in shares) at Dec. 31, 2020 |  |  |  | 75,798 |  |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2020 | $ 480,461 |  |  | $ 758 |  | $ 282,206 |  | $ 5,563 |  | $ 200,893 |  |  | $ (8,959) |
[1] | See Note 8 — Allowance for Doubtful Accounts herein regarding the new credit-loss guidance

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