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Condensed Consolidated Statements of Shareholders' Equity (Unaudited) - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive (Loss) Income [Member]
--- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2017 | $ 300,170 | $ 282,666 | $ 17,542 | $ (38)
Beginning balance, shares at Dec. 31, 2017 |  | 31,908 |  |
Cumulative effect of accounting change | 15,132 |  | 15,132 |
Net income | 23,846 |  | 23,846 |
Comprehensive income (loss) | 15 |  |  | 15
Dividends declared on common stock ($1.00 per share) | (32,518) |  | (32,518) |
Stock based compensation | 328 | $ 328 |  |
Common stock issued under stock plans, net of shares withheld for employee taxes | 2,071 | $ 2,071 |  |
Common stock issued under stock plans, net of shares withheld for employee taxes, shares |  | 394 |  |
Ending balance at Mar. 31, 2018 | 309,044 | $ 285,065 | 24,002 | (23)
Ending balance, shares at Mar. 31, 2018 |  | 32,302 |  |
Beginning balance at Dec. 31, 2017 | 300,170 | $ 282,666 | 17,542 | (38)
Beginning balance, shares at Dec. 31, 2017 |  | 31,908 |  |
Net income | 29,427 |  |  |
Comprehensive income (loss) | 21 |  |  |
Ending balance at Sep. 30, 2018 | 315,694 | $ 286,128 | 29,583 | (17)
Ending balance, shares at Sep. 30, 2018 |  | 32,325 |  |
Beginning balance at Mar. 31, 2018 | 309,044 | $ 285,065 | 24,002 | (23)
Beginning balance, shares at Mar. 31, 2018 |  | 32,302 |  |
Net income | 2,545 |  | 2,545 |
Comprehensive income (loss) | (10) |  |  | (10)
Stock based compensation | 427 | $ 427 |  |
Common stock issued under stock plans, net of shares withheld for employee taxes | 181 | $ 181 |  |
Common stock issued under stock plans, net of shares withheld for employee taxes, shares |  | 15 |  |
Ending balance at Jun. 30, 2018 | 312,187 | $ 285,673 | 26,547 | (33)
Ending balance, shares at Jun. 30, 2018 |  | 32,317 |  |
Net income | 3,036 |  | 3,036 |
Comprehensive income (loss) | 16 |  |  | 16
Stock based compensation | 460 | $ 460 |  |
Common stock issued under stock plans, net of shares withheld for employee taxes | (5) | $ (5) |  |
Common stock issued under stock plans, net of shares withheld for employee taxes, shares |  | 8 |  |
Ending balance at Sep. 30, 2018 | 315,694 | $ 286,128 | 29,583 | (17)
Ending balance, shares at Sep. 30, 2018 |  | 32,325 |  |
Beginning balance at Dec. 31, 2018 | $ 318,947 | $ 286,597 | 32,373 | (23)
Beginning balance, shares at Dec. 31, 2018 | 32,325 | 32,325 |  |
Net income | $ 5,974 |  | 5,974 |
Comprehensive income (loss) | 32 |  |  | 32
Stock based compensation | 516 | $ 516 |  |
Common stock issued under stock plans, net of shares withheld for employee taxes | (328) | $ (328) |  |
Common stock issued under stock plans, net of shares withheld for employee taxes, shares |  | 63 |  |
Ending balance at Mar. 31, 2019 | 325,141 | $ 286,785 | 38,347 | 9
Ending balance, shares at Mar. 31, 2019 |  | 32,388 |  |
Beginning balance at Dec. 31, 2018 | $ 318,947 | $ 286,597 | 32,373 | (23)
Beginning balance, shares at Dec. 31, 2018 | 32,325 | 32,325 |  |
Net income | $ 12,087 |  |  |
Comprehensive income (loss) | 32 |  |  |
Ending balance at Sep. 30, 2019 | $ 333,893 | $ 289,424 | 44,460 | 9
Ending balance, shares at Sep. 30, 2019 | 32,378 | 32,378 |  |
Beginning balance at Mar. 31, 2019 | $ 325,141 | $ 286,785 | 38,347 | 9
Beginning balance, shares at Mar. 31, 2019 |  | 32,388 |  |
Net income | 2,401 |  | 2,401 |
Comprehensive income (loss) | 14 |  |  | 14
Stock donated to Company (held in treasury) |  | (86) |  |
Stock based compensation | 2,558 | $ 2,558 |  |
Common stock issued under stock plans, net of shares withheld for employee taxes | (443) | $ (443) |  |
Common stock issued under stock plans, net of shares withheld for employee taxes, shares |  | 72 |  |
Ending balance at Jun. 30, 2019 | 329,671 | $ 288,900 | 40,748 | 23
Ending balance, shares at Jun. 30, 2019 |  | 32,374 |  |
Net income | 3,712 |  | 3,712 |
Comprehensive income (loss) | (14) |  |  | (14)
Stock based compensation | 569 | $ 569 |  |
Common stock issued under stock plans, net of shares withheld for employee taxes | (45) | $ (45) |  |
Common stock issued under stock plans, net of shares withheld for employee taxes, shares |  | 4 |  |
Ending balance at Sep. 30, 2019 | $ 333,893 | $ 289,424 | $ 44,460 | $ 9
Ending balance, shares at Sep. 30, 2019 | 32,378 | 32,378 |  |

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