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Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Treasury Stock | Additional Paid-In Capital | Accumulated Earnings | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | --- | ---
Common Stock, Beginning of period (in shares) at Dec. 31, 2015 |  | 44,739 |  |  |  |
Stockholders' Equity, Beginning of period at Dec. 31, 2015 | $ 420,464 | $ 45 | $ (185,074) | $ 490,354 | $ 117,869 | $ (2,730)
Treasury Stock, Beginning of period (in shares) at Dec. 31, 2015 |  |  | 9,145 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 9,756 |  |  |  | 9,756 |
Other comprehensive loss | (6,789) |  |  |  |  | (6,789)
Share-based compensation | 19,500 |  |  | 19,500 |  |
Issuance of common stock under employee stock plans (in shares) |  | 1,039 |  |  |  |
Issuance of common stock under employee stock plans | 17,692 | $ 1 |  | 17,691 |  |
Tax payments related to restricted stock units | (3,490) |  |  | (3,490) |  |
Income tax benefits from employee stock plans | 1,703 |  |  | 1,703 |  |
Common Stock, End of period (in shares) at Dec. 31, 2016 |  | 45,778 |  |  |  |
Stockholders' Equity, End of period at Dec. 31, 2016 | 458,836 | $ 46 | $ (185,074) | 525,758 | 127,625 | (9,519)
Treasury Stock, End of period (in shares) at Dec. 31, 2016 |  |  | 9,145 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 30,518 |  |  |  | 30,518 |
Other comprehensive loss | 3,406 |  |  |  |  | 3,406
At the market offering, net of offering costs (in shares) |  | 294 |  |  |  |
At the market equity offering, net of costs | 13,900 |  |  | 13,900 |  |
Share-based compensation | 21,857 |  |  | 21,857 |  |
Issuance of common stock under employee stock plans (in shares) |  | 1,505 |  |  |  |
Issuance of common stock under employee stock plans | 30,123 | $ 2 |  | 30,121 |  |
Tax payments related to restricted stock units | (5,892) |  |  | (5,892) |  |
Income tax benefits from employee stock plans | 11 |  |  | 11 |  |
Common Stock, End of period (in shares) at Dec. 31, 2017 |  | 47,577 |  |  |  |
Stockholders' Equity, End of period at Dec. 31, 2017 | $ 554,341 | $ 48 | $ (185,074) | 585,755 | 159,725 | (6,113)
Treasury Stock, End of period (in shares) at Dec. 31, 2017 | 9,145 |  | 9,145 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Cumulative effect of a change in accounting principle related to share-based compensation | $ 1,582 |  |  |  | 1,582 |
Net income | 37,729 |  |  |  | 37,729 |
Other comprehensive loss | (4,741) |  |  |  |  | (4,741)
At the market offering, net of offering costs (in shares) |  | 557 |  |  |  |
At the market equity offering, net of costs | 39,567 | $ 1 |  | 39,566 |  |
Share-based compensation | 28,885 |  |  | 28,885 |  |
Issuance of common stock under employee stock plans (in shares) |  | 1,346 |  |  |  |
Issuance of common stock under employee stock plans | 30,611 | $ 1 |  | 30,610 |  |
Tax payments related to restricted stock units | (6,775) |  |  | (6,775) |  |
Common Stock, End of period (in shares) at Dec. 31, 2018 |  | 49,480 |  |  |  |
Stockholders' Equity, End of period at Dec. 31, 2018 | $ 679,617 | $ 50 | $ (185,074) | $ 678,041 | $ 197,454 | $ (10,854)
Treasury Stock, End of period (in shares) at Dec. 31, 2018 | 9,145 |  | 9,145 |  |  |

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