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Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) $ in Thousands | Total | Common Stock [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | ---
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 |  | 14,466 |
Share-based compensation | 864 | $ 864 |  |
Common stock issued under stock Plans, net of shares withheld for employee taxes, Shares |  | 50,000 |  |
Taxes paid related to net share settlement of stock awards | (971) | $ (971) |  |
Dividends accrued of $0.375, $0.375, $0.375, $0.34, $0.34, and $0.34 per share for three months ended March 31, 2019, June 30, 2019, September 30, 2019 and three months ended March 31 2018, June 30, 2018, September 30, 2018 | (8,237) |  | (8,237) |
Other comprehensive income (loss) | (22) |  |  | (22)
Balance at Mar. 31, 2018 | 530,284 | $ 102,840 | 427,634 | (190)
Balance, Shares at Mar. 31, 2018 |  | 24,102,000 |  |
Balance at Dec. 31, 2017 | 524,184 | $ 102,947 | 421,405 | (168)
Balance, Shares at Dec. 31, 2017 |  | 24,052,000 |  |
Net income | 55,157 |  |  |
Balance at Sep. 30, 2018 | 554,547 | $ 102,753 | 451,794 |
Balance, Shares at Sep. 30, 2018 |  | 24,176,000 |  |
Balance at Mar. 31, 2018 | 530,284 | $ 102,840 | 427,634 | (190)
Balance, Shares at Mar. 31, 2018 |  | 24,102,000 |  |
Net income | 15,912 |  | 15,912 |
Share-based compensation | 964 | $ 964 |  |
Common stock issued under stock Plans, net of shares withheld for employee taxes, Shares |  | 68,000 |  |
Taxes paid related to net share settlement of stock awards | (1,821) | $ (1,821) |  |
Dividends accrued of $0.375, $0.375, $0.375, $0.34, $0.34, and $0.34 per share for three months ended March 31, 2019, June 30, 2019, September 30, 2019 and three months ended March 31 2018, June 30, 2018, September 30, 2018 | (8,267) |  | (8,267) |
Other comprehensive income (loss) | 123 |  |  | 123
Balance at Jun. 30, 2018 | 537,195 | $ 101,983 | 435,279 | (67)
Balance, Shares at Jun. 30, 2018 |  | 24,170,000 |  |
Net income | 24,779 |  | 24,779 |
Share-based compensation | 982 | $ 982 |  |
Common stock issued under stock Plans, net of shares withheld for employee taxes, Shares |  | 6,000 |  |
Taxes paid related to net share settlement of stock awards | (212) | $ (212) |  |
Dividends accrued of $0.375, $0.375, $0.375, $0.34, $0.34, and $0.34 per share for three months ended March 31, 2019, June 30, 2019, September 30, 2019 and three months ended March 31 2018, June 30, 2018, September 30, 2018 | (8,264) |  | (8,264) |
Other comprehensive income (loss) | 67 |  |  | 67
Balance at Sep. 30, 2018 | 554,547 | $ 102,753 | 451,794 |
Balance, Shares at Sep. 30, 2018 |  | 24,176,000 |  |
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 |  | 18,449 |
Share-based compensation | 1,392 | $ 1,392 |  |
Common stock issued under stock Plans, net of shares withheld for employee taxes, Shares |  | 40,000 |  |
Taxes paid related to net share settlement of stock awards | (1,555) | $ (1,555) |  |
Dividends accrued of $0.375, $0.375, $0.375, $0.34, $0.34, and $0.34 per share for three months ended March 31, 2019, June 30, 2019, September 30, 2019 and three months ended March 31 2018, June 30, 2018, September 30, 2018 | (9,151) |  | (9,151) |
Other comprehensive income (loss) | (27) |  |  | (27)
Balance at Mar. 31, 2019 | 580,643 | $ 103,638 | 477,081 | (76)
Balance, Shares at Mar. 31, 2019 |  | 24,222,000 |  |
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 | $ 70,405 |  |  |
Balance at Sep. 30, 2019 | $ 616,715 | $ 106,033 | 510,702 | (20)
Balance, Shares at Sep. 30, 2019 | 24,285,000 | 24,285,000 |  |
Balance at Mar. 31, 2019 | $ 580,643 | $ 103,638 | 477,081 | (76)
Balance, Shares at Mar. 31, 2019 |  | 24,222,000 |  |
Net income | 19,488 |  | 19,488 |
Share-based compensation | 1,354 | $ 1,354 |  |
Common stock issued under stock Plans, net of shares withheld for employee taxes, Shares |  | 31,000 |  |
Taxes paid related to net share settlement of stock awards | (8) | $ (8) |  |
Dividends accrued of $0.375, $0.375, $0.375, $0.34, $0.34, and $0.34 per share for three months ended March 31, 2019, June 30, 2019, September 30, 2019 and three months ended March 31 2018, June 30, 2018, September 30, 2018 | (9,162) |  | (9,162) |
Other comprehensive income (loss) | (6) |  |  | (6)
Balance at Jun. 30, 2019 | 592,309 | $ 104,984 | 487,407 | (82)
Balance, Shares at Jun. 30, 2019 |  | 24,253,000 |  |
Net income | 32,468 |  | 32,468 |
Share-based compensation | 1,350 | $ 1,350 |  |
Common stock issued under stock Plans, net of shares withheld for employee taxes, Shares |  | 32,000 |  |
Taxes paid related to net share settlement of stock awards | (301) | $ (301) |  |
Dividends accrued of $0.375, $0.375, $0.375, $0.34, $0.34, and $0.34 per share for three months ended March 31, 2019, June 30, 2019, September 30, 2019 and three months ended March 31 2018, June 30, 2018, September 30, 2018 | (9,173) |  | (9,173) |
Other comprehensive income (loss) | 62 |  |  | 62
Balance at Sep. 30, 2019 | $ 616,715 | $ 106,033 | $ 510,702 | $ (20)
Balance, Shares at Sep. 30, 2019 | 24,285,000 | 24,285,000 |  |

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