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CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Common Stock | Additional Paid-In Capital | Retained Earnings | Treasury Stock | Accumulated Other Comprehensive Loss | Total
--- | --- | --- | --- | --- | --- | ---
Balances at Dec. 31, 2016 |  |  |  |  | $ (23,417) |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income |  |  |  |  |  | $ 23,158
Other comprehensive income, net of tax |  |  |  |  | 1,216 | 1,216
Balances at Sep. 30, 2017 |  |  |  |  | (22,201) |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Adjustments to beginning retained earnings for adoption of accounting standards | ASC Topic 606 and ASC Topic 220 |  |  | $ 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 |  |  | 51,963 |  |  | 51,963
Other comprehensive income, net of tax |  |  |  |  | 1,530 | 1,530
Issuance of common stock under share-based compensation plans (in shares) | 52 |  |  |  |  |
Tax effect of share-based compensation plans |  | (88) |  |  |  | (88)
Share-based compensation expense |  | 6,185 |  |  |  | 6,185
Purchase of treasury stock |  |  |  | $ (201) |  | (201)
Purchase of treasury stock (in shares) |  |  |  | 5 |  |
Dividends declared on common stock |  |  | (6,176) |  |  | (6,176)
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 |  |

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