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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Retained Earnings (Deficit) | Accumulated Other Comprehensive Losses | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Balance at beginning of period at Dec. 31, 2015 | $ 439,809 | $ 715 | $ 642,908 | $ (111,909) | $ (1,500) | $ (90,405)
Balance beginning of period (in shares) at Dec. 31, 2015 |  | 64,929,510 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income for the year | 119,433 |  |  | 119,433 |  |
Foreign currency translation and other | (1,347) |  |  |  | (1,347) |
Stock-based compensation | 12,037 | $ 6 | 12,031 |  |  |
Stock-based compensation (in shares) |  | 615,066 |  |  |  |
Stock repurchase | (79,556) |  |  |  |  | (79,556)
Stock repurchase (in shares) |  | (5,832,387) |  |  |  |
Equity component of convertible senior notes repurchase | (18,883) |  | (18,883) |  |  |
Common stock dividends | (3,933) |  |  | (3,933) |  |
Stock option exercises | 4,831 | $ 4 | 4,827 |  |  |
Stock option exercises (in shares) |  | 417,442 |  |  |  |
Balance at end of period at Dec. 31, 2016 | 472,391 | $ 725 | 640,883 | 3,591 | (2,847) | (169,961)
Balance end of period (in shares) at Dec. 31, 2016 |  | 60,129,631 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income for the year | 111,422 |  |  | 111,422 |  |
Foreign currency translation and other | 462 |  |  |  | 462 |
Stock-based compensation | 10,429 | $ 7 | 10,422 |  |  |
Stock-based compensation (in shares) |  | 650,218 |  |  |  |
Stock repurchase | (74,491) |  |  |  |  | (74,491)
Stock repurchase (in shares) |  | (3,726,809) |  |  |  |
Equity component of convertible senior notes repurchase | (3,655) |  | (3,655) |  |  |
Common stock dividends | (16,285) |  |  | (16,285) |  |
Stock option exercises | 5,790 | $ 5 | 5,785 |  |  |
Stock option exercises (in shares) |  | 511,453 |  |  |  |
Balance at end of period at Dec. 31, 2017 | 506,063 | $ 737 | 653,435 | 98,728 | (2,385) | (244,452)
Balance end of period (in shares) at Dec. 31, 2017 |  | 57,564,493 |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income for the year | 69,421 |  |  | 69,421 |  |
Foreign currency translation and other | (193) |  |  |  | (193) |
Stock-based compensation | 10,169 | $ 6 | 10,163 |  |  |
Stock-based compensation (in shares) |  | 404,628 |  |  |  |
Stock repurchase | (58,383) |  |  |  |  | (58,383)
Stock repurchase (in shares) |  | (2,935,978) |  |  |  |
Equity component of convertible senior notes repurchase | (35,519) |  | (35,519) |  |  |
Common stock dividends | (17,905) |  |  | (17,905) |  |
Unrealized loss on derivative instruments, net of tax | (765) |  |  |  | (765) |
Stock option exercises | 961 | $ 1 | 960 |  |  |
Stock option exercises (in shares) |  | 102,645 |  |  |  |
Balance at end of period at Dec. 31, 2018 | $ 473,849 | $ 744 | $ 629,039 | $ 150,244 | $ (3,343) | $ (302,835)
Balance end of period (in shares) at Dec. 31, 2018 |  | 55,135,788 |  |  |  |

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