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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Common Stock | Additional Paid-In Capital | Retained Earnings | Treasury Stock | Accumulated Other Comprehensive Loss | Total
--- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Adjustments to beginning retained earnings for adoption of accounting standards |  |  | $ 3,992 |  | $ (3,576) | $ 416
Adjusted Balances | $ 285 | $ 319,436 | 442,371 | $ (86,064) | (24,150) | 651,878
Balances at Dec. 31, 2017 | $ 285 | 319,436 | 438,379 | $ (86,064) | (20,574) | 651,462
Balances (in shares) at Dec. 31, 2017 | 28,496 |  |  | 2,852 |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income |  |  | 9,954 |  |  | 9,954
Other comprehensive income, net of tax |  |  |  |  | 4,072 | 4,072
Issuance of common stock under share-based compensation plans (in shares) | 3 |  |  |  |  |
Tax effect of share-based compensation plans |  | (41) |  |  |  | (41)
Share-based compensation expense |  | 1,870 |  |  |  | 1,870
Purchase of treasury stock |  |  |  | $ (201) |  | (201)
Purchase of treasury stock (in shares) |  |  |  | 5 |  |
Dividends declared on common stock |  |  | (2,058) |  |  | (2,058)
Balances at Mar. 31, 2018 | $ 285 | 321,265 | 450,267 | $ (86,265) | (20,078) | 665,474
Balances (in shares) at Mar. 31, 2018 | 28,499 |  |  | 2,857 |  |
Balances at Dec. 31, 2017 | $ 285 | 319,436 | 438,379 | $ (86,064) | (20,574) | 651,462
Balances (in shares) at Dec. 31, 2017 | 28,496 |  |  | 2,852 |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income |  |  |  |  |  | 51,963
Other comprehensive income, net of tax |  |  |  |  | 1,530 | 1,530
Balances at Sep. 30, 2018 | $ 285 | 325,533 | 488,158 | $ (86,265) | (22,620) | 705,091
Balances (in shares) at Sep. 30, 2018 | 28,548 |  |  | 2,857 |  |
Balances at Mar. 31, 2018 | $ 285 | 321,265 | 450,267 | $ (86,265) | (20,078) | 665,474
Balances (in shares) at Mar. 31, 2018 | 28,499 |  |  | 2,857 |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income |  |  | 1,233 |  |  | 1,233
Other comprehensive income, net of tax |  |  |  |  | 2,236 | 2,236
Issuance of common stock under share-based compensation plans (in shares) | 43 |  |  |  |  |
Tax effect of share-based compensation plans |  | (44) |  |  |  | (44)
Share-based compensation expense |  | 1,674 |  |  |  | 1,674
Dividends declared on common stock |  |  | (2,058) |  |  | (2,058)
Balances at Jun. 30, 2018 | $ 285 | 322,895 | 449,442 | $ (86,265) | (17,842) | 668,515
Balances (in shares) at Jun. 30, 2018 | 28,542 |  |  | 2,857 |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income |  |  | 40,776 |  |  | 40,776
Other comprehensive income, net of tax |  |  |  |  | (4,778) | (4,778)
Issuance of common stock under share-based compensation plans (in shares) | 6 |  |  |  |  |
Tax effect of share-based compensation plans |  | (3) |  |  |  | (3)
Share-based compensation expense |  | 2,641 |  |  |  | 2,641
Dividends declared on common stock |  |  | (2,060) |  |  | (2,060)
Balances at Sep. 30, 2018 | $ 285 | 325,533 | 488,158 | $ (86,265) | (22,620) | 705,091
Balances (in shares) at Sep. 30, 2018 | 28,548 |  |  | 2,857 |  |
Balances at Dec. 31, 2018 | $ 287 | 325,712 | 501,389 | $ (95,468) | (14,238) | 717,682
Balances (in shares) at Dec. 31, 2018 | 28,685 |  |  | 3,098 |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income |  |  | 4,888 |  |  | 4,888
Other comprehensive income, net of tax |  |  |  |  | 1,850 | 1,850
Tax effect of share-based compensation plans |  | (8) |  |  |  | (8)
Share-based compensation expense |  | 2,058 |  |  |  | 2,058
Purchase of treasury stock |  |  |  | $ (2,663) |  | (2,663)
Purchase of treasury stock (in shares) |  |  |  | 74 |  |
Dividends declared on common stock |  |  | (2,052) |  |  | (2,052)
Balances at Mar. 31, 2019 | $ 287 | 327,762 | 504,225 | $ (98,131) | (12,388) | 721,755
Balances (in shares) at Mar. 31, 2019 | 28,685 |  |  | 3,172 |  |
Balances at Dec. 31, 2018 | $ 287 | 325,712 | 501,389 | $ (95,468) | (14,238) | 717,682
Balances (in shares) at Dec. 31, 2018 | 28,685 |  |  | 3,098 |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income |  |  |  |  |  | 45,534
Other comprehensive income, net of tax |  |  |  |  | 6,608 | 6,608
Balances at Sep. 30, 2019 | $ 288 | 331,773 | 540,778 | $ (101,583) | (7,630) | 763,626
Balances (in shares) at Sep. 30, 2019 | 28,801 |  |  | 3,300 |  |
Balances at Mar. 31, 2019 | $ 287 | 327,762 | 504,225 | $ (98,131) | (12,388) | 721,755
Balances (in shares) at Mar. 31, 2019 | 28,685 |  |  | 3,172 |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income |  |  | 24,376 |  |  | 24,376
Other comprehensive income, net of tax |  |  |  |  | (41) | (41)
Issuance of common stock under share-based compensation plans | $ 1 | (1) |  |  |  |
Issuance of common stock under share-based compensation plans (in shares) | 101 |  |  |  |  |
Tax effect of share-based compensation plans |  | (1,174) |  |  |  | (1,174)
Share-based compensation expense |  | 2,801 |  |  |  | 2,801
Purchase of treasury stock |  |  |  | $ (2,508) |  | (2,508)
Purchase of treasury stock (in shares) |  |  |  | 94 |  |
Dividends declared on common stock |  |  | (2,050) |  |  | (2,050)
Balances at Jun. 30, 2019 | $ 288 | 329,388 | 526,551 | $ (100,639) | (12,429) | 743,159
Balances (in shares) at Jun. 30, 2019 | 28,786 |  |  | 3,266 |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income |  |  | 16,270 |  |  | 16,270
Other comprehensive income, net of tax |  |  |  |  | 4,799 | 4,799
Issuance of common stock under share-based compensation plans (in shares) | 15 |  |  |  |  |
Tax effect of share-based compensation plans |  | (24) |  |  |  | (24)
Share-based compensation expense |  | 2,409 |  |  |  | 2,409
Purchase of treasury stock |  |  |  | $ (944) |  | (944)
Purchase of treasury stock (in shares) |  |  |  | 34 |  |
Dividends declared on common stock |  |  | (2,043) |  |  | (2,043)
Balances at Sep. 30, 2019 | $ 288 | $ 331,773 | $ 540,778 | $ (101,583) | $ (7,630) | $ 763,626
Balances (in shares) at Sep. 30, 2019 | 28,801 |  |  | 3,300 |  |

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