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Condensed 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, 2017 |  | 47,577 |  |  |  |
Beginning balance at Dec. 31, 2017 | $ 554,341 | $ 48 | $ (185,074) | $ 585,755 | $ 159,725 | $ (6,113)
Treasury Stock, Beginning of period (in shares) at Dec. 31, 2017 |  |  | (9,145) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 2,720 |  |  |  | 2,720 |
Other comprehensive income | 2,674 |  |  |  |  | 2,674
Share-based compensation | 6,528 |  |  | 6,528 |  |
Issuance of common stock under employee stock plans (in shares) |  | 428 |  |  |  |
Issuance of common stock under employee stock plans | 9,541 | $ 0 |  | 9,541 |  |
Tax payments related to restricted stock units | (1,300) |  |  | (1,300) |  |
Common Stock, End of period (in shares) at Mar. 31, 2018 |  | 48,005 |  |  |  |
Ending balance at Mar. 31, 2018 | 574,504 | $ 48 | $ (185,074) | 600,524 | 162,445 | (3,439)
Treasury Stock, End of period (in shares) at Mar. 31, 2018 |  |  | (9,145) |  |  |
Common Stock, Beginning of period (in shares) at Dec. 31, 2017 |  | 47,577 |  |  |  |
Beginning balance at Dec. 31, 2017 | 554,341 | $ 48 | $ (185,074) | 585,755 | 159,725 | (6,113)
Treasury Stock, Beginning of period (in shares) at Dec. 31, 2017 |  |  | (9,145) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 9,308 |  |  |  |  |
Other comprehensive income | (1,830) |  |  |  |  |
Common Stock, End of period (in shares) at Jun. 30, 2018 |  | 48,346 |  |  |  |
Ending balance at Jun. 30, 2018 | 588,640 | $ 48 | $ (185,074) | 612,576 | 169,033 | (7,943)
Treasury Stock, End of period (in shares) at Jun. 30, 2018 |  |  | (9,145) |  |  |
Common Stock, Beginning of period (in shares) at Mar. 31, 2018 |  | 48,005 |  |  |  |
Beginning balance at Mar. 31, 2018 | 574,504 | $ 48 | $ (185,074) | 600,524 | 162,445 | (3,439)
Treasury Stock, Beginning of period (in shares) at Mar. 31, 2018 |  |  | (9,145) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 6,588 |  |  |  | 6,588 |
Other comprehensive income | (4,504) |  |  |  |  | (4,504)
Share-based compensation | 7,238 |  |  | 7,238 |  |
Issuance of common stock under employee stock plans (in shares) |  | 341 |  |  |  |
Issuance of common stock under employee stock plans | 6,576 | $ 0 |  | 6,576 |  |
Tax payments related to restricted stock units | (1,762) |  |  | (1,762) |  |
Common Stock, End of period (in shares) at Jun. 30, 2018 |  | 48,346 |  |  |  |
Ending balance at Jun. 30, 2018 | 588,640 | $ 48 | $ (185,074) | 612,576 | 169,033 | (7,943)
Treasury Stock, End of period (in shares) at Jun. 30, 2018 |  |  | (9,145) |  |  |
Common Stock, Beginning of period (in shares) at Dec. 31, 2018 |  | 49,480 |  |  |  |
Beginning balance at Dec. 31, 2018 | $ 679,617 | $ 50 | $ (185,074) | 678,041 | 197,454 | (10,854)
Treasury Stock, Beginning of period (in shares) at Dec. 31, 2018 | (9,145) |  | (9,145) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | $ 3,284 |  |  |  | 3,284 |
Other comprehensive income | 352 |  |  |  |  | 352
At the market equity offering, net of costs ( in shares ) |  | 243 |  |  |  |
At the market equity offering, net of costs | 20,216 |  |  | 20,216 |  |
Share-based compensation | 8,410 |  |  | 8,410 |  |
Issuance of common stock under employee stock plans (in shares) |  | 628 |  |  |  |
Issuance of common stock under employee stock plans | 20,526 | $ 0 |  | 20,526 |  |
Tax payments related to restricted stock units | (1,920) |  |  | (1,920) |  |
Common Stock, End of period (in shares) at Mar. 31, 2019 |  | 50,351 |  |  |  |
Ending balance at Mar. 31, 2019 | 730,485 | $ 50 | $ (185,074) | 725,273 | 200,738 | (10,502)
Treasury Stock, End of period (in shares) at Mar. 31, 2019 |  |  | (9,145) |  |  |
Common Stock, Beginning of period (in shares) at Dec. 31, 2018 |  | 49,480 |  |  |  |
Beginning balance at Dec. 31, 2018 | $ 679,617 | $ 50 | $ (185,074) | 678,041 | 197,454 | (10,854)
Treasury Stock, Beginning of period (in shares) at Dec. 31, 2018 | (9,145) |  | (9,145) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | $ 19,260 |  |  |  |  |
Other comprehensive income | (722) |  |  |  |  |
Common Stock, End of period (in shares) at Jun. 30, 2019 |  | 50,784 |  |  |  |
Ending balance at Jun. 30, 2019 | $ 773,242 | $ 51 | $ (185,074) | 753,127 | 216,714 | (11,576)
Treasury Stock, End of period (in shares) at Jun. 30, 2019 | (9,145) |  | (9,145) |  |  |
Common Stock, Beginning of period (in shares) at Mar. 31, 2019 |  | 50,351 |  |  |  |
Beginning balance at Mar. 31, 2019 | $ 730,485 | $ 50 | $ (185,074) | 725,273 | 200,738 | (10,502)
Treasury Stock, Beginning of period (in shares) at Mar. 31, 2019 |  |  | (9,145) |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 15,976 |  |  |  | 15,976 |
Other comprehensive income | (1,074) |  |  |  |  | (1,074)
At the market equity offering, net of costs ( in shares ) |  | 217 |  |  |  |
At the market equity offering, net of costs | 17,590 |  |  | 17,590 |  |
Share-based compensation | 8,260 |  |  | 8,260 |  |
Issuance of common stock under employee stock plans (in shares) |  | 216 |  |  |  |
Issuance of common stock under employee stock plans | 4,807 | $ 1 |  | 4,806 |  |
Tax payments related to restricted stock units | (2,802) |  |  | (2,802) |  |
Common Stock, End of period (in shares) at Jun. 30, 2019 |  | 50,784 |  |  |  |
Ending balance at Jun. 30, 2019 | $ 773,242 | $ 51 | $ (185,074) | $ 753,127 | $ 216,714 | $ (11,576)
Treasury Stock, End of period (in shares) at Jun. 30, 2019 | (9,145) |  | (9,145) |  |  |

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