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UNAUDITED CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Shares at beginning of period (in shares) at Dec. 31, 2017 |  | 71,494 |  |  |  | 45,167
Balance at beginning of period at Dec. 31, 2017 | $ 134,277 | $ 715 | $ 437,394 | $ 100 | $ 195,143 | $ (499,075)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 9,175 |  |  |  | 9,175 |
Issuance for stock-based compensation and dividends, net of forfeitures (in shares) |  | 63 |  |  |  |
Issuance for stock-based compensation and dividends, net of forfeitures | 0 | $ 1 | 166 |  | (167) |
Exercise of stock options (in shares) |  | 5 |  |  |  | 1
Exercise of stock options | 0 |  | 46 |  |  | $ (46)
Stock-based compensation expense | 2,260 |  | 2,260 |  |  |
Employee stock purchase plan (in shares) |  |  |  |  |  | (6)
Employee stock purchase plan | 132 |  | 71 |  |  | $ 61
Dividends | (2,973) |  |  |  | (2,973) |
Change in fair value of interest swap, net of tax | 517 |  |  | 517 |  |
Repurchases of common stock (in shares) |  |  |  |  |  | 319
Repurchases of common stock | (8,715) |  |  |  |  | $ (8,715)
Shares at end of period (in shares) at Mar. 31, 2018 |  | 71,562 |  |  |  | 45,481
Balance at end of period at Mar. 31, 2018 | 134,494 | $ 716 | 439,937 | 617 | 200,999 | $ (507,775)
Shares at beginning of period (in shares) at Dec. 31, 2017 |  | 71,494 |  |  |  | 45,167
Balance at beginning of period at Dec. 31, 2017 | 134,277 | $ 715 | 437,394 | 100 | 195,143 | $ (499,075)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 41,624 |  |  |  |  |
Employee stock purchase plan | 405 |  |  |  |  |
Change in fair value of interest swap, net of tax | 807 |  |  |  |  |
Shares at end of period (in shares) at Sep. 30, 2018 |  | 71,544 |  |  |  | 45,483
Balance at end of period at Sep. 30, 2018 | 163,947 | $ 716 | 444,762 | 907 | 225,658 | $ (508,096)
Shares at beginning of period (in shares) at Mar. 31, 2018 |  | 71,562 |  |  |  | 45,481
Balance at beginning of period at Mar. 31, 2018 | 134,494 | $ 716 | 439,937 | 617 | 200,999 | $ (507,775)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 16,272 |  |  |  | 16,272 |
Issuance for stock-based compensation and dividends, net of forfeitures (in shares) |  | 34 |  |  |  |
Issuance for stock-based compensation and dividends, net of forfeitures | 0 |  | 158 |  | (158) |
Stock-based compensation expense | 2,292 |  | 2,292 |  |  |
Employee stock purchase plan (in shares) |  |  |  |  |  | (5)
Employee stock purchase plan | 129 |  | 73 |  |  | $ 56
Dividends | (2,970) |  |  |  | (2,970) |
Change in fair value of interest swap, net of tax | 180 |  |  | 180 |  |
Repurchases of common stock (in shares) |  |  |  |  |  | 3
Repurchases of common stock | (91) |  |  |  |  | $ (91)
Shares at end of period (in shares) at Jun. 30, 2018 |  | 71,596 |  |  |  | 45,479
Balance at end of period at Jun. 30, 2018 | 150,306 | $ 716 | 442,460 | 797 | 214,143 | $ (507,810)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 16,177 |  |  |  | 16,177 |
Issuance for stock-based compensation and dividends, net of forfeitures (in shares) |  | (52) |  |  |  |
Issuance for stock-based compensation and dividends, net of forfeitures | 0 |  | 201 |  | (201) |
Stock-based compensation expense | 2,006 |  | 2,006 |  |  |
Employee stock purchase plan (in shares) |  |  |  |  |  | (4)
Employee stock purchase plan | 144 |  | 95 |  |  | $ 49
Dividends | (4,461) |  |  |  | (4,461) |
Change in fair value of interest swap, net of tax | 110 |  |  | 110 |  |
Repurchases of common stock (in shares) |  |  |  |  |  | 8
Repurchases of common stock | (335) |  |  |  |  | $ (335)
Shares at end of period (in shares) at Sep. 30, 2018 |  | 71,544 |  |  |  | 45,483
Balance at end of period at Sep. 30, 2018 | 163,947 | $ 716 | 444,762 | 907 | 225,658 | $ (508,096)
Shares at beginning of period (in shares) at Dec. 31, 2018 |  | 71,856 |  |  |  | 45,822
Balance at beginning of period at Dec. 31, 2018 | 168,331 | $ 719 | 447,337 | 1,296 | 237,308 | $ (518,329)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 26,855 |  |  |  | 26,855 |
Reclassification of stranded tax effects (Note A) | Accounting Standards Update 2018-02 | 0 |  |  | 168 | (168) |
Issuance for stock-based compensation and dividends, net of forfeitures (in shares) |  | 4 |  |  |  |
Issuance for stock-based compensation and dividends, net of forfeitures | 0 |  | 233 |  | (233) |
Stock-based compensation expense | 2,620 |  | 2,620 |  |  |
Employee stock purchase plan (in shares) |  |  |  |  |  | (5)
Employee stock purchase plan | 140 |  | 86 |  |  | $ 54
Dividends | (4,406) |  |  |  | (4,406) |
Change in fair value of interest rate swap, net of tax | (280) |  |  | (280) |  |
Repurchases of common stock (in shares) |  |  |  |  |  | 432
Repurchases of common stock | (14,688) |  |  |  |  | $ (14,688)
Shares at end of period (in shares) at Mar. 31, 2019 |  | 71,860 |  |  |  | 46,249
Balance at end of period at Mar. 31, 2019 | 178,572 | $ 719 | 450,276 | 1,184 | 259,356 | $ (532,963)
Shares at beginning of period (in shares) at Dec. 31, 2018 |  | 71,856 |  |  |  | 45,822
Balance at beginning of period at Dec. 31, 2018 | 168,331 | $ 719 | 447,337 | 1,296 | 237,308 | $ (518,329)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 116,654 |  |  |  |  |
Employee stock purchase plan | 427 |  |  |  |  |
Change in fair value of interest rate swap, net of tax | (871) |  |  |  |  |
Shares at end of period (in shares) at Sep. 30, 2019 |  | 71,874 |  |  |  | 48,458
Balance at end of period at Sep. 30, 2019 | 187,925 | $ 719 | 456,802 | 593 | 340,436 | $ (610,625)
Shares at beginning of period (in shares) at Mar. 31, 2019 |  | 71,860 |  |  |  | 46,249
Balance at beginning of period at Mar. 31, 2019 | 178,572 | $ 719 | 450,276 | 1,184 | 259,356 | $ (532,963)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 74,859 |  |  |  | 74,859 |
Issuance for stock-based compensation and dividends, net of forfeitures (in shares) |  | 5 |  |  |  |
Issuance for stock-based compensation and dividends, net of forfeitures | 0 |  | 177 |  | (177) |
Stock-based compensation expense | 3,524 |  | 3,524 |  |  |
Employee stock purchase plan (in shares) |  |  |  |  |  | (4)
Employee stock purchase plan | 143 |  | 94 |  |  | $ 49
Dividends | (4,278) |  |  |  | (4,278) |
Change in fair value of interest rate swap, net of tax | (478) |  |  | (478) |  |
Repurchases of common stock (in shares) |  |  |  |  |  | 1,048
Repurchases of common stock | (37,486) |  |  |  |  | $ (37,486)
Shares at end of period (in shares) at Jun. 30, 2019 |  | 71,865 |  |  |  | 47,293
Balance at end of period at Jun. 30, 2019 | 214,856 | $ 719 | 454,071 | 706 | 329,760 | $ (570,400)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 14,940 |  |  |  | 14,940 |
Issuance for stock-based compensation and dividends, net of forfeitures (in shares) |  | 9 |  |  |  |
Issuance for stock-based compensation and dividends, net of forfeitures | 0 |  | 221 |  | (221) |
Stock-based compensation expense | 2,419 |  | 2,419 |  |  |
Employee stock purchase plan (in shares) |  |  |  |  |  | (4)
Employee stock purchase plan | 144 |  | 91 |  |  | $ 53
Dividends | (4,043) |  |  |  | (4,043) |
Change in fair value of interest rate swap, net of tax | (113) |  |  | (113) |  |
Repurchases of common stock (in shares) |  |  |  |  |  | 1,169
Repurchases of common stock | (40,278) |  |  |  |  | $ (40,278)
Shares at end of period (in shares) at Sep. 30, 2019 |  | 71,874 |  |  |  | 48,458
Balance at end of period at Sep. 30, 2019 | $ 187,925 | $ 719 | $ 456,802 | $ 593 | $ 340,436 | $ (610,625)

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