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Consolidated Statements of Stockholders' Equity - USD ($) $ 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, 2018 |  |  |  | 75,344,000 |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 | $ 440,780 |  |  | $ 753 |  | $ 259,440 |  | $ 158 |  | $ 190,092 |  |  | $ (9,663) |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income for the period | 9,156 |  |  |  |  |  |  |  |  | 9,156 |  |  |  |
Unrealized loss on available-for-sale marketable securities, net of taxes | 1,416 |  |  |  |  |  |  | 1,416 |  |  |  |  |  |
Total comprehensive income | 10,572 |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options and other stock-based compensation, net of shares tendered for payment (in shares) |  |  |  | 115,000 |  |  |  |  |  |  |  |  |  |
Exercise of stock options and other share-based compensation, net of shares tendered for payment | 1,913 |  |  | $ 2 |  | 1,911 |  |  |  |  |  |  |  |
Payment of statutory withholding on issuance of restricted stock and restricted stock units | (579) |  |  |  |  | (579) |  |  |  |  |  |  |  |
Share-based compensation expense — stock options, restricted stock and restricted stock units | 1,656 |  |  |  |  | 1,656 |  |  |  |  |  |  |  |
Treasury shares issued for Deferred Compensation Plan funding and redemptions | 536 |  |  |  |  | 535 |  |  |  |  |  |  | 1 |
Shares issued pursuant to Employee Stock Plan | 2,130 |  |  |  |  | 1,781 |  |  |  |  |  |  | 349 |
Dividends paid and accrued, $0.20 per share | (14,656) |  |  |  |  |  |  |  |  | (14,656) |  |  |  |
Shares issued pursuant to Dividend Reinvestment Plan | 23 |  |  |  |  | 18 |  |  |  |  |  |  | 5 |
Other (in shares) |  |  |  | 6,000 |  |  |  |  |  |  |  |  |  |
Other | 174 |  |  |  |  | 174 |  |  |  |  |  |  |  |
Balance (in shares) at Mar. 31, 2019 |  |  |  | 75,465,000 |  |  |  |  |  |  |  |  |  |
Ending balance at Mar. 31, 2019 | 442,549 |  |  | $ 755 |  | 264,936 |  | 1,574 |  | 184,592 |  |  | (9,308) |
Balance (in shares) at Dec. 31, 2018 |  |  |  | 75,344,000 |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 | 440,780 |  |  | $ 753 |  | 259,440 |  | 158 |  | 190,092 |  |  | (9,663) |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income for the period | 27,342 |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized loss on available-for-sale marketable securities, net of taxes | 2,207 |  |  |  |  |  |  |  |  |  |  |  |  |
Total comprehensive income | 29,549 |  |  |  |  |  |  |  |  |  |  |  |  |
Balance (in shares) at Jun. 30, 2019 |  |  |  | 75,519,000 |  |  |  |  |  |  |  |  |  |
Ending balance at Jun. 30, 2019 | 449,648 |  |  | $ 755 |  | 267,853 |  | 2,365 |  | 188,025 |  |  | (9,350) |
Balance (in shares) at Dec. 31, 2018 |  |  |  | 75,344,000 |  |  |  |  |  |  |  |  |  |
Beginning balance at Dec. 31, 2018 | 440,780 |  |  | $ 753 |  | 259,440 |  | 158 |  | 190,092 |  |  | (9,663) |
Balance (in shares) at Dec. 31, 2019 |  |  |  | 75,557,000 | 75,557,000 |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |
Balance (in shares) at Mar. 31, 2019 |  |  |  | 75,465,000 |  |  |  |  |  |  |  |  |  |
Beginning balance at Mar. 31, 2019 | $ 442,549 |  |  | $ 755 |  | 264,936 |  | 1,574 |  | 184,592 |  |  | (9,308) |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income for the period | 18,186 |  |  |  |  |  |  |  |  | 18,186 |  |  |  |
Unrealized loss on available-for-sale marketable securities, net of taxes | 791 |  |  |  |  |  |  | 791 |  |  |  |  |  |
Total comprehensive income | 18,977 |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options and other stock-based compensation, net of shares tendered for payment (in shares) |  |  |  | 54,000 |  |  |  |  |  |  |  |  |  |
Exercise of stock options and other share-based compensation, net of shares tendered for payment | 1,186 |  |  |  |  | 1,186 |  |  |  |  |  |  |  |
Share-based compensation expense — stock options, restricted stock and restricted stock units | 1,668 |  |  |  |  | 1,668 |  |  |  |  |  |  |  |
Treasury shares issued for Deferred Compensation Plan funding and redemptions | (2) |  |  |  |  | 45 |  |  |  |  |  |  | (47) |
Dividends paid and accrued, $0.20 per share | (14,753) |  |  |  |  |  |  |  |  | (14,753) |  |  |  |
Shares issued pursuant to Dividend Reinvestment Plan | 23 |  |  |  |  | 18 |  |  |  |  |  |  | 5 |
Balance (in shares) at Jun. 30, 2019 |  |  |  | 75,519,000 |  |  |  |  |  |  |  |  |  |
Ending balance at Jun. 30, 2019 | 449,648 |  |  | $ 755 |  | 267,853 |  | 2,365 |  | 188,025 |  |  | (9,350) |
Balance (in shares) at Dec. 31, 2019 |  |  |  | 75,557,000 | 75,557,000 |  |  |  |  |  |  |  |  |
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) |  |  |  |  |  |
Total comprehensive income | 19,657 |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options and other stock-based compensation, net of shares tendered for payment (in shares) |  |  |  | 162,000 |  |  |  |  |  |  |  |  |  |
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 — stock options, restricted stock and restricted stock units | 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, $0.20 per share | (15,142) |  |  |  |  |  |  |  |  | (15,142) |  |  |  |
Shares issued pursuant to Dividend Reinvestment Plan | 23 |  |  |  |  | 16 |  |  |  |  |  |  | 7 |
Other (in shares) |  |  |  | 6,000 |  |  |  |  |  |  |  |  |  |
Other | 187 |  |  |  |  | 187 |  |  |  |  |  |  |  |
Balance (in shares) at Mar. 31, 2020 |  |  |  | 75,725,000 |  |  |  |  |  |  |  |  |  |
Ending balance at Mar. 31, 2020 | 438,179 |  |  | $ 757 |  | 275,447 |  | 2,386 |  | 168,404 |  |  | (8,815) |
Balance (in shares) at Dec. 31, 2019 |  |  |  | 75,557,000 | 75,557,000 |  |  |  |  |  |  |  |  |
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 | 43,291 |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized loss on available-for-sale marketable securities, net of taxes | 1,123 |  |  |  |  |  |  |  |  |  |  |  |  |
Total comprehensive income | 44,414 |  |  |  |  |  |  |  |  |  |  |  |  |
Balance (in shares) at Jun. 30, 2020 |  |  |  | 75,732,000 |  |  |  |  |  |  |  |  |  |
Ending balance at Jun. 30, 2020 | 449,687 |  |  | $ 757 |  | 277,482 |  | 4,042 |  | 176,268 |  |  | (8,862) |
Balance (in shares) at Mar. 31, 2020 |  |  |  | 75,725,000 |  |  |  |  |  |  |  |  |  |
Beginning balance at Mar. 31, 2020 | 438,179 |  |  | $ 757 |  | 275,447 |  | 2,386 |  | 168,404 |  |  | (8,815) |
Comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income for the period | 23,101 |  |  |  |  |  |  |  |  | 23,101 |  |  |  |
Unrealized loss on available-for-sale marketable securities, net of taxes | 1,656 |  |  |  |  |  |  | 1,656 |  |  |  |  |  |
Total comprehensive income | 24,757 |  |  |  |  |  |  |  |  |  |  |  |  |
Exercise of stock options and other stock-based compensation, net of shares tendered for payment (in shares) |  |  |  | 7,000 |  |  |  |  |  |  |  |  |  |
Exercise of stock options and other share-based compensation, net of shares tendered for payment | 138 |  |  |  |  | 138 |  |  |  |  |  |  |  |
Share-based compensation expense — stock options, restricted stock and restricted stock units | 1,830 |  |  |  |  | 1,830 |  |  |  |  |  |  |  |
Treasury shares issued for Deferred Compensation Plan funding and redemptions | (2) |  |  |  |  | 51 |  |  |  |  |  |  | (53) |
Dividends paid and accrued, $0.20 per share | (15,237) |  |  |  |  |  |  |  |  | (15,237) |  |  |  |
Shares issued pursuant to Dividend Reinvestment Plan | 22 |  |  |  |  | 16 |  |  |  |  |  |  | 6 |
Balance (in shares) at Jun. 30, 2020 |  |  |  | 75,732,000 |  |  |  |  |  |  |  |  |  |
Ending balance at Jun. 30, 2020 | $ 449,687 |  |  | $ 757 |  | $ 277,482 |  | $ 4,042 |  | $ 176,268 |  |  | $ (8,862) |
[1] | See Note 4—Allowance for Doubtful Accounts regarding the new credit-loss guidance

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