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Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Adjustment to adopt credit-loss guidance | [1] | Balance, January 1, 2020 | Common Stock | Common Stock Balance, January 1, 2020 | Additional Paid-in Capital | Additional Paid-in Capital Balance, January 1, 2020 | Accumulated Other Comprehensive Income, net of taxes | Accumulated Other Comprehensive Income, net of taxes Balance, January 1, 2020 | Retained Earnings | Retained Earnings Adjustment to adopt credit-loss guidance | [1] | Retained Earnings Balance, January 1, 2020 | Treasury Stock | Treasury Stock Balance, January 1, 2020
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2019 |  |  |  | 75,557 | 75,557 |  |  |  |  |  |  |  |  |
Beginning 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: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income for the period | 20,190 |  |  |  |  |  |  |  |  | 20,190 |  |  |  |
Unrealized loss on available-for-sale marketable securities, net of taxes | (533) |  |  |  |  |  |  | (533) |  |  |  |  |  |
Comprehensive income for the period | 19,657 |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options and other share-based compensation, net of shares tendered for payment (in shares) |  |  |  | 162 |  |  |  |  |  |  |  |  |  |
Exercise of stock options and other share-based compensation, net of shares tendered for payment | 1,724 |  |  | $ 1 |  | 1,723 |  |  |  |  |  |  |  |
Payment of statutory withholding on issuance of restricted stock and restricted stock units | (661) |  |  |  |  | (661) |  |  |  |  |  |  |  |
Share-based compensation expense | 1,822 |  |  |  |  | 1,822 |  |  |  |  |  |  |  |
Treasury shares issued for Deferred Compensation Plan funding and redemptions | 528 |  |  |  |  | 417 |  |  |  |  |  |  | 111 |
Shares issued pursuant to Employee Stock Plan | 1,835 |  |  |  |  | 1,329 |  |  |  |  |  |  | 506 |
Dividends paid and accrued, $0.21 per share | (15,142) |  |  |  |  |  |  |  |  | (15,142) |  |  |  |
Shares issued pursuant to Dividend Reinvestment Plan | 23 |  |  |  |  | 16 |  |  |  |  |  |  | 7 |
Other (in shares) |  |  |  | 6 |  |  |  |  |  |  |  |  |  |
Other | 187 |  |  |  |  | 187 |  |  |  |  |  |  |  |
Balance (in shares) at Mar. 31, 2020 |  |  |  | 75,725 |  |  |  |  |  |  |  |  |  |
Ending balance at Mar. 31, 2020 | 438,179 |  |  | $ 757 |  | 275,447 |  | 2,386 |  | 168,404 |  |  | (8,815) |
Balance (in shares) at Dec. 31, 2020 |  |  |  | 75,798 |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2020 | 480,461 |  |  | $ 758 |  | 282,206 |  | 5,563 |  | 200,893 |  |  | (8,959) |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income for the period | 24,653 |  |  |  |  |  |  |  |  | 24,653 |  |  |  |
Unrealized loss on available-for-sale marketable securities, net of taxes | (1,271) |  |  |  |  |  |  | (1,271) |  |  |  |  |  |
Comprehensive income for the period | 23,382 |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options and other share-based compensation, net of shares tendered for payment (in shares) |  |  |  | 156 |  |  |  |  |  |  |  |  |  |
Exercise of stock options and other share-based compensation, net of shares tendered for payment | 1,475 |  |  | $ 2 |  | 1,473 |  |  |  |  |  |  |  |
Payment of statutory withholding on issuance of restricted stock and restricted stock units | (1,501) |  |  |  |  | (1,501) |  |  |  |  |  |  |  |
Share-based compensation expense | 2,104 |  |  |  |  | 2,104 |  |  |  |  |  |  |  |
Treasury shares issued for Deferred Compensation Plan funding and redemptions | 509 |  |  |  |  | 545 |  |  |  |  |  |  | (36) |
Shares issued pursuant to Employee Stock Plan | 2,052 |  |  |  |  | 1,554 |  |  |  |  |  |  | 498 |
Dividends paid and accrued, $0.21 per share | (15,526) |  |  |  |  |  |  |  |  | (15,526) |  |  |  |
Shares issued pursuant to Dividend Reinvestment Plan | 23 |  |  |  |  | 18 |  |  |  |  |  |  | 5 |
Other (in shares) |  |  |  | 4 |  |  |  |  |  |  |  |  |  |
Other | 123 |  |  |  |  | 123 |  |  |  |  |  |  |  |
Balance (in shares) at Mar. 31, 2021 |  |  |  | 75,958 |  |  |  |  |  |  |  |  |  |
Ending balance at Mar. 31, 2021 | $ 493,102 |  |  | $ 760 |  | $ 286,522 |  | $ 4,292 |  | $ 210,020 |  |  | $ (8,492) |
[1] | See Note 4—Allowance for Doubtful Accounts regarding the new credit-loss guidance

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