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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Losses | Treasury Stock
--- | --- | --- | --- | --- | --- | ---
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance at beginning of period (in shares) |  | 57,564,493 |  |  |  |
Balance at beginning of period (in shares) |  | 58,037,554 |  |  |  |
Balance at beginning of period at Dec. 31, 2017 | $ 506,063 | $ 737 | $ 653,435 | $ 98,728 | $ (2,385) | $ (244,452)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income for the year | 21,272 |  |  | 21,272 |  |
Foreign currency translation and other | 409 |  |  |  | 409 |
Stock-based compensation (in shares) |  | 380,588 |  |  |  |
Stock-based compensation | 2,657 | $ 6 | 2,651 |  |  |
Stock repurchase | (5,412) |  |  |  |  | (5,412)
Equity component of convertible senior notes repurchase | (7,830) |  | (7,830) |  |  |
Common stock dividends | (4,748) |  |  | (4,748) |  |
Stock option exercises (in shares) |  | 92,473 |  |  |  |
Stock option exercises | 861 | $ 1 | 860 |  |  |
Balance at end of period (in shares) at Mar. 31, 2018 |  | 58,037,554 |  |  |  |
Balance at end of period at Mar. 31, 2018 | 513,272 | $ 744 | 649,116 | 115,252 | (1,976) | (249,864)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance at beginning of period (in shares) |  | 57,267,116 |  |  |  |
Balance at beginning of period at Dec. 31, 2017 | 506,063 | $ 737 | 653,435 | 98,728 | (2,385) | (244,452)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income for the year | 53,174 |  |  |  |  |
Foreign currency translation and other | (236) |  |  |  |  |
Balance at end of period (in shares) at Jun. 30, 2018 |  | 57,267,116 |  |  |  |
Balance at end of period at Jun. 30, 2018 | 499,215 | $ 744 | 624,209 | 142,747 | (2,620) | (265,865)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance at beginning of period (in shares) |  | 58,037,554 |  |  |  |
Balance at beginning of period (in shares) |  | 57,267,116 |  |  |  |
Balance at beginning of period at Mar. 31, 2018 | 513,272 | $ 744 | 649,116 | 115,252 | (1,976) | (249,864)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income for the year | 31,902 |  |  | 31,902 |  |
Foreign currency translation and other | (644) |  |  |  | (644) |
Stock-based compensation (in shares) |  | 24,040 |  |  |  |
Stock-based compensation | 2,733 | $ 0 | 2,733 |  |  |
Stock repurchase (in shares) |  | (798,992) |  |  |  |
Stock repurchase | (16,001) |  |  |  |  | (16,001)
Equity component of convertible senior notes repurchase | (27,689) |  | (27,689) |  |  |
Common stock dividends | (4,407) |  |  | (4,407) |  |
Stock option exercises (in shares) |  | 4,514 |  |  |  |
Stock option exercises | 49 | $ 0 | 49 |  |  |
Balance at end of period (in shares) at Jun. 30, 2018 |  | 57,267,116 |  |  |  |
Balance at end of period at Jun. 30, 2018 | 499,215 | $ 744 | 624,209 | 142,747 | (2,620) | (265,865)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance at beginning of period (in shares) |  | 57,267,116 |  |  |  |
Balance at beginning of period (in shares) |  | 55,135,788 |  |  |  |
Balance at beginning of period (in shares) |  | 55,424,133 |  |  |  |
Balance at beginning of period at Dec. 31, 2018 | 473,849 | $ 744 | 629,039 | 150,244 | (3,343) | (302,835)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income for the year | 14,780 |  |  | 14,780 |  |
Foreign currency translation and other | 298 |  |  |  | 298 |
Stock-based compensation (in shares) |  | 273,158 |  |  |  |
Stock-based compensation | 2,586 | $ 5 | 2,581 |  |  |
Stock repurchase | (2,635) |  |  |  |  | (2,635)
Common stock dividends | (4,512) |  |  | (4,512) |  |
Unrealized loss on derivative instruments, net of tax | (814) |  |  |  | (814) |
Stock option exercises (in shares) |  | 15,187 |  |  |  |
Stock option exercises | 54 |  | 54 |  |  |
Balance at end of period (in shares) at Mar. 31, 2019 |  | 55,424,133 |  |  |  |
Balance at end of period at Mar. 31, 2019 | 483,606 | $ 749 | 631,674 | 160,512 | (3,859) | (305,470)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance at beginning of period (in shares) |  | 54,675,691 |  |  |  |
Balance at beginning of period at Dec. 31, 2018 | 473,849 | $ 744 | 629,039 | 150,244 | (3,343) | (302,835)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income for the year | 45,740 |  |  |  |  |
Foreign currency translation and other | 183 |  |  |  |  |
Balance at end of period (in shares) at Jun. 30, 2019 |  | 54,675,691 |  |  |  |
Balance at end of period at Jun. 30, 2019 | 501,565 | $ 749 | 634,465 | 186,934 | (3,896) | (316,687)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance at beginning of period (in shares) |  | 55,424,133 |  |  |  |
Balance at beginning of period (in shares) |  | 54,675,691 |  |  |  |
Balance at beginning of period at Mar. 31, 2019 | 483,606 | $ 749 | 631,674 | 160,512 | (3,859) | (305,470)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income for the year | 30,960 |  |  | 30,960 |  |
Foreign currency translation and other | (115) |  |  |  | (115) |
Stock-based compensation (in shares) |  | 26,639 |  |  |  |
Stock-based compensation | 2,791 | $ 0 | 2,791 |  |  |
Stock repurchase (in shares) |  | (775,081) |  |  |  |
Stock repurchase | (11,217) |  |  |  |  | (11,217)
Common stock dividends | (4,538) |  |  | (4,538) |  |
Unrealized loss on derivative instruments, net of tax | 78 |  |  |  | 78 |
Stock option exercises (in shares) |  |  |  |  |  |
Stock option exercises | 0 |  |  |  |  |
Balance at end of period (in shares) at Jun. 30, 2019 |  | 54,675,691 |  |  |  |
Balance at end of period at Jun. 30, 2019 | $ 501,565 | $ 749 | $ 634,465 | $ 186,934 | $ (3,896) | $ (316,687)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Balance at beginning of period (in shares) |  | 54,675,691 |  |  |  |

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