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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Number of Common Shares outstanding | Treasury shares | Additional Paid-In Capital | Retained earnings Cumulative Effect, Period of Adoption, Adjustment [Member] | Retained earnings | Accumulated other comprehensive loss | Cumulative Effect, Period of Adoption, Adjustment [Member] | Total
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (ASU 2016-09) at Dec. 31, 2017 |  |  |  | $ 139 |  |  | $ 139 |
Balance at Dec. 31, 2017 |  | $ (7,118) | $ 228,486 |  | $ 92,264 | $ (69,560) |  | $ 244,072
Common Stock, Share, Beginning Balance (in shares) at Dec. 31, 2017 | 28,180 |  |  |  |  |  |  |
Treasury Stock, Shares, Beginning Balance at Dec. 31, 2017 |  | 786 |  |  |  |  |  |
Net income (loss) |  |  |  |  | 53,848 |  |  | 53,848
Unrealized gain (loss) on derivatives, net |  |  |  |  |  | 435 |  | 435
Currency translation adjustments |  |  |  |  |  | (16,627) |  | (16,627)
Issuance of restricted Common Shares ( in shares) | 461 | (461) |  |  |  |  |  |
Repurchased Common Shares for treasury |  | $ (1,762) |  |  |  |  |  | (1,762)
Repurchased Common Shares for treasury (in shares) | (153) | 153 |  |  |  |  |  |
Share-based compensation |  |  | 3,161 |  |  |  |  | 3,161
Balance at Dec. 31, 2018 |  | $ (8,880) | 231,647 |  | 146,251 | (85,752) |  | 283,266
Common Stock, Share, Ending Balance (in shares) at Dec. 31, 2018 | 28,488 |  |  |  |  |  |  |
Treasury Stock, Shares, Ending Balance at Dec. 31, 2018 |  | 478 |  |  |  |  |  |
Net income (loss) |  |  |  |  | 60,291 |  |  | 60,291
Unrealized gain (loss) on derivatives, net |  |  |  |  |  | (292) |  | (292)
Currency translation adjustments |  |  |  |  |  | (5,428) |  | (5,428)
Issuance of Common Shares ( in shares) | 407 |  |  |  |  |  |  |
Issuance of Common Shares ( in treasury shares) |  | (407) |  |  |  |  |  |
Repurchased Common Shares for treasury, net |  | $ (1,893) |  |  |  |  |  | (1,893)
Repurchased Common Shares for treasury (in shares) | (137) |  |  |  |  |  |  |
Repurchased Common Shares for treasury (in treasury shares) |  | 137 |  |  |  |  |  |
Common Share repurchase program |  | $ (40,000) | (10,000) |  |  |  |  | (50,000)
Common Share repurchase program (in shares) | (1,350) |  |  |  |  |  |  |
Common Share repurchase program (in treasury shares) |  | 1,350 |  |  |  |  |  |
Share-based compensation |  |  | 3,960 |  |  |  |  | 3,960
Balance (ASU 2019-12 [Member]) at Dec. 31, 2019 |  |  |  | $ 13,750 |  |  | $ 13,750 |
Balance at Dec. 31, 2019 |  | $ (50,773) | 225,607 |  | 206,542 | (91,472) |  | $ 289,904
Common Stock, Share, Ending Balance (in shares) at Dec. 31, 2019 | 27,408 |  |  |  |  |  |  | 27,408
Treasury Stock, Shares, Ending Balance at Dec. 31, 2019 |  | 1,558 |  |  |  |  |  | 1,558
Net income (loss) |  |  |  |  | (7,950) |  |  | $ (7,950)
Unrealized gain (loss) on derivatives, net |  |  |  |  |  | (840) |  | (840)
Currency translation adjustments |  |  |  |  |  | 2,677 |  | 2,677
Issuance of Common Shares ( in shares) | 285 |  |  |  |  |  |  |
Issuance of Common Shares ( in treasury shares) |  | (285) |  |  |  |  |  |
Repurchased Common Shares for treasury, net |  | $ 5,286 |  |  |  |  |  | 5,286
Repurchased Common Shares for treasury (in shares) | (80) |  |  |  |  |  |  |
Repurchased Common Shares for treasury (in treasury shares) |  | 80 |  |  |  |  |  |
Common Share repurchase program | $ (607) | $ (14,995) | 10,000 |  |  |  |  | (4,995)
Common Share repurchase program (in shares) |  | 607 |  |  |  |  |  |
Share-based compensation |  |  | (1,198) |  |  |  |  | (1,198)
Balance at Dec. 31, 2020 |  | $ (60,482) | $ 234,409 |  | $ 212,342 | $ (89,635) |  | $ 296,634
Common Stock, Share, Ending Balance (in shares) at Dec. 31, 2020 | 27,006 |  |  |  |  |  |  | 27,006
Treasury Stock, Shares, Ending Balance at Dec. 31, 2020 |  | 1,960 |  |  |  |  |  | 1,960

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