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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Shares Held In Treasury | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2016 | $ 468,417 | $ 211 | $ 438,489 | $ 32,524 | $ (2,899) | $ 92
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Restricted stock grants | 0 | 3 | (3) |  |  |
Employee Stock Purchase Plan | 836 | 1 | 835 |  |  |
Share award amortization | 4,671 |  | 4,671 |  |  |
Cancellation of restricted stock | (48) |  | (48) |  | 0 |
Purchase of treasury shares | (52) |  |  |  | (52) |
Net loss | (28,161) |  |  | (28,161) |  |
Currency translation adjustments, net of tax | 18 |  |  |  |  | 18
Ending Balance at Dec. 31, 2017 | 445,681 | 215 | 443,944 | 4,363 | (2,951) | 110
Beginning Balance at Dec. 31, 2016 | 4,221 |  |  |  |  |
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |
Net loss | (454) |  |  |  |  |
Ending Balance at Dec. 31, 2017 | 3,766 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Restricted stock grants | 0 | 3 | (3) |  |  |
Employee Stock Purchase Plan | 893 | 1 | 892 |  |  |
Share award amortization | 2,940 |  | 2,940 |  |  |
Cancellation of stock options | 0 |  | (475) |  | 475 |
Net loss | 13,922 |  |  | 13,922 |  |
Ending Balance at Dec. 31, 2018 | 463,436 | 219 | 447,298 | 18,285 | (2,476) | 110
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |
Net loss | (464) |  |  |  |  |
Ending Balance at Dec. 31, 2018 | 3,302 |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Restricted stock grants | 0 | 4 | (4) |  |  |
Employee Stock Purchase Plan | 1,077 | 1 | 1,076 |  |  |
Share award amortization | 3,641 |  | 3,641 |  |  |
Purchase of treasury shares | (7,707) |  |  |  | (7,707) |
Net loss | (3,593) |  |  |  |  |
Exercise of call option | (2) |  | (2) |  |  |
Currency translation adjustments, net of tax | (110) |  |  |  |  | (110)
Ending Balance at Dec. 31, 2019 | 456,742 | $ 224 | $ 452,009 | $ 14,692 | $ (10,183) | $ 0
Increase (Decrease) in Temporary Equity [Roll Forward] |  |  |  |  |  |
Net loss | (488) |  |  |  |  |
Exercise of call option | (2) |  |  |  |  |
Ending Balance at Dec. 31, 2019 | $ 2,812 |  |  |  |  |

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