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Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands | Total | Common Stock [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | ---
Balance at Dec. 31, 2016 | $ 394,287 | $ 101,821 | $ 292,521 | $ (55)
Balance, Shares at Dec. 31, 2016 |  | 23,948,000 |  |
Net income | 153,920 |  | 153,920 |
Share-based compensation | 3,198 | $ 3,198 |  |
Common stock issued under stock Plans, net of shares withheld for employee taxes, Shares |  | 104,000 |  |
Taxes paid related to net share settlement of stock awards | (2,072) | $ (2,072) |  |
Dividends accrued at $1.04, $1.36, $1.50 per share in 2017, 2018 and 2019 | (25,036) |  | (25,036) |
Other comprehensive (loss) gain | (113) |  |  | (113)
Balance at Dec. 31, 2017 | 524,184 | $ 102,947 | 421,405 | (168)
Balance, Shares at Dec. 31, 2017 |  | 24,052,000 |  |
Net income | 14,466 |  |  |
Balance at Mar. 31, 2018 | 530,284 |  |  |
Balance at Dec. 31, 2017 | 524,184 | $ 102,947 | 421,405 | (168)
Balance, Shares at Dec. 31, 2017 |  | 24,052,000 |  |
Net income | 79,406 |  | 79,406 |
Share-based compensation | 4,111 | $ 4,111 |  |
Common stock issued under stock Plans, net of shares withheld for employee taxes, Shares |  | 130,000 |  |
Taxes paid related to net share settlement of stock awards | (3,257) | $ (3,257) |  |
Dividends accrued at $1.04, $1.36, $1.50 per share in 2017, 2018 and 2019 | (33,028) |  | (33,028) |
Other comprehensive (loss) gain | 119 |  |  | 119
Balance at Dec. 31, 2018 | $ 571,535 | $ 103,801 | 467,783 | (49)
Balance, Shares at Dec. 31, 2018 | 24,182,000 | 24,182,000 |  |
Balance at Mar. 31, 2018 | $ 530,284 |  |  |
Net income | 15,912 |  |  |
Balance at Jun. 30, 2018 | 537,195 |  |  |
Net income | 24,779 |  |  |
Balance at Sep. 30, 2018 | 554,547 |  |  |
Net income | 24,249 |  |  |
Balance at Dec. 31, 2018 | $ 571,535 | $ 103,801 | 467,783 | (49)
Balance, Shares at Dec. 31, 2018 | 24,182,000 | 24,182,000 |  |
Net income | $ 18,449 |  |  |
Balance at Mar. 31, 2019 | 580,643 |  |  |
Balance at Dec. 31, 2018 | $ 571,535 | $ 103,801 | 467,783 | (49)
Balance, Shares at Dec. 31, 2018 | 24,182,000 | 24,182,000 |  |
Net income | $ 96,806 |  | 96,806 |
Share-based compensation | 5,892 | $ 5,892 |  |
Common stock issued under stock Plans, net of shares withheld for employee taxes, Shares |  | 114,000 |  |
Taxes paid related to net share settlement of stock awards | (3,333) | $ (3,333) |  |
Dividends accrued at $1.04, $1.36, $1.50 per share in 2017, 2018 and 2019 | (36,843) |  | (36,843) |
Other comprehensive (loss) gain | (21) |  |  | (21)
Balance at Dec. 31, 2019 | $ 634,036 | $ 106,360 | 527,746 | (70)
Balance, Shares at Dec. 31, 2019 | 24,296,000 | 24,296,000 |  |
Balance at Mar. 31, 2019 | $ 580,643 |  |  |
Net income | 19,488 |  |  |
Balance at Jun. 30, 2019 | 592,309 |  |  |
Net income | 32,468 |  |  |
Balance at Sep. 30, 2019 | 616,715 |  |  |
Net income | 26,401 |  |  |
Balance at Dec. 31, 2019 | $ 634,036 | $ 106,360 | $ 527,746 | $ (70)
Balance, Shares at Dec. 31, 2019 | 24,296,000 | 24,296,000 |  |

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