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Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Loss | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Balance, shares at Dec. 31, 2013 |  | 31,131,000 |  |  |  | 395,000
Balance at Dec. 31, 2013 | $ 471,749 | $ 311 | $ 243,389 | $ 236,449 | $ (3,585) | $ (4,815)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | (81,824) |  |  | (81,824) |  |
Foreign currency translation adjustment | (4,364) |  |  |  | (4,364) |
Adjustment to retirement benefit liability, net of tax | (24) |  |  |  | (24) |
Adjustment to post-retirement healthcare benefit liability, net of taxes | (1,435) |  |  |  | (1,435) |
Unrealized loss on cash flow hedges, net of tax | 143 |  |  |  | 143 |
Stock compensation expense | 3,150 |  | 3,150 |  |  |
Excess tax benefit from stock compensation | 100 |  | 100 |  |  |
Net settlement of restricted stock units, shares |  | 136,000 |  |  |  | 34,000
Net settlement of restricted stock units | $ (575) | $ 1 | (1) |  |  | $ (575)
Issuance of restricted stock, shares |  | 22,000 |  |  |  |
Stock options exercised, shares | 52,805 | 53,000 |  |  |  |
Stock options exercised | $ 595 | $ 1 | 594 |  |  |
Balance, shares at Dec. 31, 2014 |  | 31,342,000 |  |  |  | 429,000
Balance at Dec. 31, 2014 | 387,229 | $ 313 | 247,232 | 154,625 | (9,551) | $ (5,390)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | 23,448 |  |  | 23,448 |  |
Foreign currency translation adjustment | (6,228) |  |  |  | (6,228) |
Adjustment to retirement benefit liability, net of tax | 49 |  |  |  | 49 |
Adjustment to post-retirement healthcare benefit liability, net of taxes | 171 |  |  |  | 171 |
Unrealized loss on cash flow hedges, net of tax | (143) |  |  |  | (143) |
Stock compensation expense | 3,891 |  | 3,891 |  |  |
Excess tax benefit from stock compensation | 537 |  | 537 |  |  |
Net settlement of restricted stock units, shares |  | 297,000 |  |  |  | 55,000
Net settlement of restricted stock units | $ (956) | $ 3 | (3) |  |  | $ (956)
Issuance of restricted stock, shares |  | 21,000 |  |  |  |
Stock options exercised, shares | 119,096 | 119,000 |  |  |  |
Stock options exercised | $ 1,802 | $ 1 | 1,801 |  |  |
Balance, shares at Dec. 31, 2015 |  | 31,779,000 |  |  |  | 484,000
Balance at Dec. 31, 2015 | 410,086 | $ 317 | 253,458 | 178,073 | (15,416) | $ (6,346)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) | 33,675 |  |  | 33,675 |  |
Foreign currency translation adjustment | 6,945 |  |  |  | 6,945 |
Adjustment to retirement benefit liability, net of tax | 55 |  |  |  | 55 |
Adjustment to post-retirement healthcare benefit liability, net of taxes | 695 |  |  |  | 695 |
Unrealized loss on cash flow hedges, net of tax | 0 |  |  |  |  |
Stock compensation expense | 6,373 |  | 6,373 |  |  |
Excess tax benefit from stock compensation | 1,249 |  | 1,249 |  |  |
Net settlement of restricted stock units, shares |  | 131,000 |  |  |  | 46,000
Net settlement of restricted stock units | $ (1,539) | $ 1 | (1) |  |  | $ (1,539)
Stock options exercised, shares | 175,125 | 175,000 |  |  |  |
Stock options exercised | $ 3,341 | $ 2 | 3,339 |  |  |
Balance, shares at Dec. 31, 2016 |  | 32,085,000 |  |  |  | 530,000
Balance at Dec. 31, 2016 | $ 460,880 | $ 320 | $ 264,418 | $ 211,748 | $ (7,721) | $ (7,885)

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