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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Common Stock [Member] | Common Stock Outstanding [Member] | Treasury Stock [Member] | Additional Paid-In Capital [Member] | Common Shares Held In Treasury [Member] | Retained Earnings (Accumulated Deficit) [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Noncontrolling interest | Total
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2014 |  |  |  | $ 192,892 | $ (1,284) | $ (54,879) | $ (45,473) | $ 22,520 | $ 113,806
Balance (shares) at Dec. 31, 2014 | 28,221 |  |  |  |  |  |  |  |
Treasury Stock, Shares, Beginning Balance at Dec. 31, 2014 |  |  | 632 |  |  |  |  |  |
Net income (loss) |  |  |  |  |  | 22,774 |  | (2,207) | 20,567
Benefit plan liability adjustments, net |  |  |  |  |  |  | (45) |  | (45)
Unrealized gain (loss) on derivatives, net |  |  |  |  |  |  | 389 |  | 389
Currency translation adjustments |  |  |  |  |  |  | (24,693) | (7,033) | $ (31,726)
Issuance of restricted Common Shares ( in shares) | 172 |  |  |  |  |  |  |  |
Issuance of restricted Common Shares ( in treasury shares) |  |  | (118) |  |  |  |  |  |
Forfeited restricted Common Shares ( in shares) | (239) |  |  |  |  |  |  |  |
Forfeited restricted Common Shares (in treasury shares) |  |  | 239 |  |  |  |  |  |
Repurchased Common Shares for treasury |  |  |  |  | (2,924) |  |  |  |
Repurchased Common Shares for treasury (in shares) |  | (242) |  |  |  |  |  |  | (2,924)
Repurchased Common Shares for treasury (in treasury shares) |  |  | 242 |  |  |  |  |  |
Share-based compensation |  |  |  | 6,362 |  |  |  |  | $ 6,362
Balance at Dec. 31, 2015 |  |  |  | 199,254 | (4,208) | (32,105) | (69,822) | 13,310 | 106,429
Balance (shares) at Dec. 31, 2015 | 27,912 |  |  |  |  |  |  |  |
Treasury Stock, Shares, Ending Balance at Dec. 31, 2015 |  |  | 995 |  |  |  |  |  |
Net income (loss) |  |  |  |  |  | 77,461 |  | (1,887) | 75,574
Benefit plan liability adjustments, net |  |  |  |  |  |  | (84) |  | (84)
Unrealized gain (loss) on derivatives, net |  |  |  |  |  |  | (408) |  | (408)
Currency translation adjustments |  |  |  |  |  |  | 2,401 | 2,339 | $ 4,740
Issuance of restricted Common Shares ( in shares) | 67 |  |  |  |  |  |  |  |
Issuance of restricted Common Shares ( in treasury shares) |  |  | (8) |  |  |  |  |  |
Forfeited restricted Common Shares ( in shares) | (3) |  |  |  |  |  |  |  |
Forfeited restricted Common Shares (in treasury shares) |  |  | 3 |  |  |  |  |  |
Repurchased Common Shares for treasury |  |  |  |  | (1,424) |  |  |  |
Repurchased Common Shares for treasury (in shares) |  | (126) |  |  |  |  |  |  | (1,424)
Repurchased Common Shares for treasury (in treasury shares) |  |  | 126 |  |  |  |  |  |
Tax benefit from share based compensation transactions |  |  |  | 977 |  |  |  |  | $ 977
Share-based compensation |  |  |  | 6,273 |  |  |  |  | 6,273
Balance at Dec. 31, 2016 |  |  |  | 206,504 | (5,632) | 45,356 | (67,913) | 13,762 | $ 192,077
Balance (shares) at Dec. 31, 2016 | 27,850 |  |  |  |  |  |  |  | 27,850
Treasury Stock, Shares, Ending Balance at Dec. 31, 2016 |  |  | 1,116 |  |  |  |  |  | 1,116
Net income (loss) |  |  |  |  |  | 45,179 |  | (130) | $ 45,049
Unrealized gain (loss) on derivatives, net |  |  |  |  |  |  | (125) |  | (125)
Currency translation adjustments |  |  |  |  |  |  | 15,473 | 826 | 16,299
Acquisition of noncontrolling interest, net |  |  |  | 15,820 |  |  | (16,995) | $ (14,458) | (15,633)
Issuance of restricted Common Shares ( in shares) | (462) |  |  |  |  |  |  |  |
Issuance of restricted Common Shares ( in treasury shares) |  |  | (462) |  |  |  |  |  |
Repurchased Common Shares for treasury |  |  |  |  | (1,486) |  |  |  | (1,486)
Repurchased Common Shares for treasury (in shares) | (132) |  |  |  |  |  |  |  |
Repurchased Common Shares for treasury (in treasury shares) |  |  | 132 |  |  |  |  |  |
Share-based compensation |  |  |  | 6,162 |  |  |  |  | 5,304
Balance (Accounting Standards Update 2016-09 [Member]) at Dec. 31, 2017 |  |  |  |  |  | 1,729 |  |  | 1,729
Balance at Dec. 31, 2017 |  |  |  | $ 228,486 | $ (7,118) | $ 92,264 | $ (69,560) |  | $ 244,072
Balance (shares) at Dec. 31, 2017 | 28,180 |  |  |  |  |  |  |  | 28,180
Treasury Stock, Shares, Ending Balance at Dec. 31, 2017 |  |  | 786 |  |  |  |  |  | 786

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