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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
--- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2017 |  | 23,760 | (9,703) |  |  |
Balance at Dec. 31, 2017 | $ 253,549 | $ 238 | $ (262,065) | $ 265,195 | $ (16,599) | $ 266,780
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | (587) |  |  |  |  | (587)
Currency translation adjustment | 3,646 |  |  |  | 3,646 |
Shares issued for employee benefit plan and compensation (in shares) |  | 42 |  |  |  |
Shares issued for employee benefit plan and compensation | 336 | $ 0 |  | 336 |  |
Purchase of treasury shares (in shares) |  |  | (13) |  |  |
Purchase of treasury shares | (615) |  | $ (615) |  |  |
Stock options exercised (in shares) |  | 20 |  |  |  |
Stock options exercised | 439 | $ 0 |  | 439 |  |
Shares issued to directors (in shares) |  | 8 |  |  |  |
Shares issued to directors | 0 | $ 0 |  | 0 |  |
Employee and director stock-based compensation | 2,204 |  |  | 2,204 |  |
Performance - based common stock warrants | 471 |  |  | 471 |  |
Balance (in shares) at Mar. 31, 2018 |  | 23,830 | (9,716) |  |  |
Balance at Mar. 31, 2018 | 263,527 | $ 238 | $ (262,680) | 268,645 | (12,953) | 270,277
Balance (in shares) at Dec. 31, 2017 |  | 23,760 | (9,703) |  |  |
Balance at Dec. 31, 2017 | 253,549 | $ 238 | $ (262,065) | 265,195 | (16,599) | 266,780
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | 23,031 |  |  |  |  |
Currency translation adjustment | $ (5,190) |  |  |  |  |
Purchase of treasury shares (in shares) | (373) |  |  |  |  |
Purchase of treasury shares | $ (12,564) |  |  |  |  |
Balance (in shares) at Sep. 30, 2018 |  | 23,892 | (10,076) |  |  |
Balance at Sep. 30, 2018 | 272,209 | $ 239 | $ (274,629) | 274,493 | (21,789) | 293,895
Balance (in shares) at Mar. 31, 2018 |  | 23,830 | (9,716) |  |  |
Balance at Mar. 31, 2018 | 263,527 | $ 238 | $ (262,680) | 268,645 | (12,953) | 270,277
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | 22,659 |  |  |  |  | 22,659
Currency translation adjustment | (5,058) |  |  |  | (5,058) |
Shares issued for employee benefit plan and compensation (in shares) |  | 14 |  |  |  |
Shares issued for employee benefit plan and compensation | 254 | $ 1 |  | 253 |  |
Purchase of treasury shares (in shares) |  |  | (212) |  |  |
Purchase of treasury shares | (6,499) |  | $ (6,499) |  |  |
Stock options exercised (in shares) |  | 10 |  |  |  |
Stock options exercised | 265 | $ 0 |  | 265 |  |
Shares issued to directors (in shares) |  | 8 |  |  |  |
Shares issued to directors | 0 | $ 0 |  | 0 |  |
Employee and director stock-based compensation | 2,465 |  |  | 2,465 |  |
Performance - based common stock warrants | (128) |  |  | (128) |  |
Balance (in shares) at Jun. 30, 2018 |  | 23,862 | (9,928) |  |  |
Balance at Jun. 30, 2018 | 277,485 | $ 239 | $ (269,179) | 271,500 | (18,011) | 292,936
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | 959 |  |  |  |  | 959
Currency translation adjustment | (3,778) |  |  |  | (3,778) |
Shares issued for employee benefit plan and compensation (in shares) |  | 18 |  |  |  |
Shares issued for employee benefit plan and compensation | 290 | $ 0 |  | 290 |  |
Purchase of treasury shares (in shares) |  |  | (148) |  |  |
Purchase of treasury shares | (5,450) |  | $ (5,450) |  |  |
Stock options exercised (in shares) |  | 5 |  |  |  |
Stock options exercised | 160 | $ 0 |  | 160 |  |
Shares issued to directors (in shares) |  | 7 |  |  |  |
Shares issued to directors | 0 | $ 0 |  |  |  |
Employee and director stock-based compensation | 2,139 |  |  | 2,139 |  |
Performance - based common stock warrants | 404 |  |  | 404 |  |
Balance (in shares) at Sep. 30, 2018 |  | 23,892 | (10,076) |  |  |
Balance at Sep. 30, 2018 | 272,209 | $ 239 | $ (274,629) | 274,493 | (21,789) | 293,895
Balance (in shares) at Dec. 31, 2018 |  | 23,933 | (10,116) |  |  |
Balance at Dec. 31, 2018 | 262,960 | $ 239 | $ (275,889) | 276,103 | (20,281) | 282,788
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | (1,005) |  |  |  |  | (1,005)
Currency translation adjustment | 1,733 |  |  |  | 1,733 |
Shares issued for employee benefit plan and compensation (in shares) |  | 78 |  |  |  |
Shares issued for employee benefit plan and compensation | 347 | $ 1 |  | 346 |  |
Purchase of treasury shares (in shares) |  |  | (43) |  |  |
Purchase of treasury shares | (1,215) |  | $ (1,215) |  |  |
Shares issued to directors (in shares) |  | 8 |  |  |  |
Shares issued to directors | 0 | $ 0 |  | 0 |  |
Employee and director stock-based compensation | 1,918 |  |  | 1,918 |  |
Performance - based common stock warrants | 434 |  |  | 434 |  |
Balance (in shares) at Mar. 31, 2019 |  | 24,019 | (10,159) |  |  |
Balance at Mar. 31, 2019 | 265,172 | $ 240 | $ (277,104) | 278,801 | (18,548) | 281,783
Balance (in shares) at Dec. 31, 2018 |  | 23,933 | (10,116) |  |  |
Balance at Dec. 31, 2018 | 262,960 | $ 239 | $ (275,889) | 276,103 | (20,281) | 282,788
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | (3,397) |  |  |  |  |
Currency translation adjustment | $ (5,557) |  |  |  |  |
Purchase of treasury shares (in shares) | (55) |  |  |  |  |
Purchase of treasury shares | $ (1,741) |  |  |  |  |
Stock options exercised (in shares) | 20 |  |  |  |  |
Balance (in shares) at Sep. 30, 2019 |  | 24,099 | (10,171) |  |  |
Balance at Sep. 30, 2019 | $ 261,651 | $ 241 | $ (277,630) | 285,487 | (25,838) | 279,391
Balance (in shares) at Mar. 31, 2019 |  | 24,019 | (10,159) |  |  |
Balance at Mar. 31, 2019 | 265,172 | $ 240 | $ (277,104) | 278,801 | (18,548) | 281,783
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | (5,061) |  |  |  |  | (5,061)
Currency translation adjustment | (1,833) |  |  |  | (1,833) |
Shares issued for employee benefit plan and compensation (in shares) |  | 17 |  |  |  |
Shares issued for employee benefit plan and compensation | 273 | $ 0 |  | 273 |  |
Purchase of treasury shares (in shares) |  |  | (5) |  |  |
Purchase of treasury shares | (189) |  | $ (189) |  |  |
Shares issued to directors (in shares) |  | 7 |  |  |  |
Shares issued to directors | 0 | $ 0 |  | 0 |  |
Employee and director stock-based compensation | 2,273 |  |  | 2,273 |  |
Performance - based common stock warrants | 236 |  |  | 236 |  |
Balance (in shares) at Jun. 30, 2019 |  | 24,043 | (10,164) |  |  |
Balance at Jun. 30, 2019 | 260,871 | $ 240 | $ (277,293) | 281,583 | (20,381) | 276,722
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | 2,669 |  |  |  |  | 2,669
Currency translation adjustment | (5,457) |  |  |  | (5,457) |
Shares issued for employee benefit plan and compensation (in shares) |  | 29 |  |  |  |
Shares issued for employee benefit plan and compensation | 256 | $ 1 |  | 255 |  |
Purchase of treasury shares (in shares) |  |  | (7) |  |  |
Purchase of treasury shares | (337) |  | $ (337) |  |  |
Stock options exercised (in shares) |  | 20 |  |  |  |
Stock options exercised | 411 |  |  | 411 |  |
Shares issued to directors (in shares) |  | 7 |  |  |  |
Shares issued to directors | 0 | $ 0 |  | 0 |  |
Employee and director stock-based compensation | 2,527 |  |  | 2,527 |  |
Performance - based common stock warrants | 711 |  |  | 711 |  |
Balance (in shares) at Sep. 30, 2019 |  | 24,099 | (10,171) |  |  |
Balance at Sep. 30, 2019 | $ 261,651 | $ 241 | $ (277,630) | $ 285,487 | $ (25,838) | $ 279,391

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