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CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock Issued | Common Stock in Treasury | Paid-in Capital | Accumulated Other Comprehensive Income (Loss) | Retained Earnings | Noncontrolling Interest
--- | --- | --- | --- | --- | --- | --- | ---
Beginning balance (in shares) at Dec. 31, 2014 |  | 22,910 | (7,008) |  |  |  |
Beginning balance at Dec. 31, 2014 | $ 315,621 | $ 229 | $ (120,938) | $ 214,710 | $ (4,446) | $ 226,066 | $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) | 29,173 |  |  |  |  | 29,174 | (1)
Currency translation adjustment | (11,353) |  |  |  | (11,353) |  |
Shares issued for employee benefit plan and compensation (in shares) |  | 165 |  |  |  |  |
Shares issued for employee benefit plan and compensation | $ 868 | $ 2 |  | 866 |  |  |
Purchase of treasury shares (in shares) | (1,817) |  | (1,817) |  |  |  |
Purchase of treasury shares | $ (89,395) |  | $ (89,395) |  |  |  |
Stock options exercised (in shares) | 71 | 71 |  |  |  |  |
Stock options exercised | $ 1,712 | $ 1 |  | 1,711 |  |  |
Shares Issued to Directors (in shares) |  | 30 |  |  |  |  |
Shares issued to directors | 0 |  |  |  |  |  |
Employee and director stock-based compensation | 7,913 |  |  | 7,913 |  |  |
Tax benefit from exercise of non-qualified stock options and vested restricted stock | 3,069 |  |  | 3,069 |  |  |
Business combination | 378 |  |  |  |  |  | 378
Distribution to noncontrolling interest | (78) |  |  |  |  |  | (78)
Ending balance (in shares) at Dec. 31, 2015 |  | 23,176 | (8,825) |  |  |  |
Ending balance at Dec. 31, 2015 | 257,908 | $ 232 | $ (210,333) | 228,269 | (15,799) | 255,240 | 299
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Net income (loss) | 20,384 |  |  |  |  | 20,354 | 30
Currency translation adjustment | (7,022) |  |  |  | (7,022) |  |
Shares issued for employee benefit plan and compensation (in shares) |  | 130 |  |  |  |  |
Shares issued for employee benefit plan and compensation | $ 913 | $ 1 |  | 912 |  |  |
Purchase of treasury shares (in shares) | (198) |  | (198) |  |  |  |
Purchase of treasury shares | $ (12,647) |  | $ (12,647) |  |  |  |
Stock options exercised (in shares) | 239 | 239 |  |  |  |  |
Stock options exercised | $ 6,244 | $ 3 |  | 6,241 |  |  |
Shares Issued to Directors (in shares) |  | 30 |  |  |  |  |
Shares issued to directors | 0 |  |  |  |  |  |
Employee and director stock-based compensation | 10,324 |  |  | 10,324 |  |  |
Tax benefit from exercise of non-qualified stock options and vested restricted stock | 2,007 |  |  | 2,007 |  |  |
Performance-based common stock warrants | 2,728 |  |  | 2,728 |  |  |
Deconsolidation of Encore Controls LLC | (329) |  |  |  |  |  | (329)
Ending balance (in shares) at Dec. 31, 2016 |  | 23,575 | (9,023) |  |  |  |
Ending balance at Dec. 31, 2016 | 280,510 | $ 236 | $ (222,980) | 250,481 | (22,821) | 275,594 | 0
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Impact to retained earnings from adoption of ASU 2016-09 | 1,509 |  |  |  |  | 1,509 |
Beginning balance, adjusted | 282,019 | $ 236 | $ (222,980) | 250,481 | (22,821) | 277,103 | 0
Net income (loss) | (10,323) |  |  |  |  | (10,323) |
Currency translation adjustment | 6,222 |  |  |  | 6,222 |  |
Shares issued for employee benefit plan and compensation (in shares) |  | 99 |  |  |  |  |
Shares issued for employee benefit plan and compensation | $ 648 | $ 1 |  | 647 |  |  |
Purchase of treasury shares (in shares) | (680) |  | (680) |  |  |  |
Purchase of treasury shares | $ (39,085) |  | $ (39,085) |  |  |  |
Stock options exercised (in shares) | 56 | 56 |  |  |  |  |
Stock options exercised | $ 1,442 | $ 1 |  | 1,441 |  |  |
Shares Issued to Directors (in shares) |  | 30 |  |  |  |  |
Shares issued to directors | 0 |  |  |  |  |  |
Employee and director stock-based compensation | 11,943 |  |  | 11,943 |  |  |
Performance-based common stock warrants | 683 |  |  | 683 |  |  |
Ending balance (in shares) at Dec. 31, 2017 |  | 23,760 | (9,703) |  |  |  |
Ending balance at Dec. 31, 2017 | $ 253,549 | $ 238 | $ (262,065) | $ 265,195 | $ (16,599) | $ 266,780 | $ 0

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