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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Common Stock | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Total
--- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2018 | $ 571,383 | $ 363,425 | $ (2,033) | $ 932,775
Beginning balance (in shares) at Dec. 31, 2018 | 54,893 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income (loss) |  | 6,195 |  | 6,195
Cumulative effect adjustment upon adoption of ASU | ASU 2016-02 |  | 93 |  | 93
Other comprehensive income (loss) |  |  | (2,515) | (2,515)
Stock-based compensation expense | $ 1,766 |  |  | 1,766
Options exercised | $ 1,365 |  |  | 1,365
Options exercised (in shares) | 95 |  |  |
Issuance of common stock under Employee Stock Purchase Plan | $ 432 |  |  | 432
Issuance of common stock under Employee Stock Purchase Plans (in shares) | 7 |  |  |
Ending balance at Mar. 31, 2019 | $ 574,946 | 369,713 | (4,548) | 940,111
Ending balance (in shares) at Mar. 31, 2019 | 54,995 |  |  |
Beginning balance at Dec. 31, 2018 | $ 571,383 | 363,425 | (2,033) | 932,775
Beginning balance (in shares) at Dec. 31, 2018 | 54,893 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income (loss) |  |  |  | 13,054
Other comprehensive income (loss) |  |  |  | (3,114)
Ending balance at Jun. 30, 2019 | $ 579,250 | 376,572 | (5,147) | 950,675
Ending balance (in shares) at Jun. 30, 2019 | 55,079 |  |  |
Beginning balance at Mar. 31, 2019 | $ 574,946 | 369,713 | (4,548) | 940,111
Beginning balance (in shares) at Mar. 31, 2019 | 54,995 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income (loss) |  | 6,859 |  | 6,859
Other comprehensive income (loss) |  |  | (599) | (599)
Stock-based compensation expense | $ 2,523 |  |  | 2,523
Options exercised | $ 1,441 |  |  | 1,441
Options exercised (in shares) | 78 |  |  |
Issuance of common stock under Employee Stock Purchase Plan | $ 340 |  |  | 340
Issuance of common stock under Employee Stock Purchase Plans (in shares) | 6 |  |  |
Ending balance at Jun. 30, 2019 | $ 579,250 | 376,572 | (5,147) | 950,675
Ending balance (in shares) at Jun. 30, 2019 | 55,079 |  |  |
Beginning balance at Dec. 31, 2019 | $ 587,017 | 368,221 | (5,294) | $ 949,944
Beginning balance (in shares) at Dec. 31, 2019 | 55,213 |  |  | 55,213
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income (loss) |  | (3,154) |  | $ (3,154)
Cumulative effect adjustment upon adoption of ASU | ASU 2016-13 |  | (575) |  | (575)
Other comprehensive income (loss) |  |  | (9,465) | (9,465)
Stock-based compensation expense | $ 2,641 |  |  | 2,641
Options exercised | $ 2,369 |  |  | 2,369
Options exercised (in shares) | 174 |  |  |
Issuance of common stock under Employee Stock Purchase Plan | $ 371 |  |  | 371
Issuance of common stock under Employee Stock Purchase Plans (in shares) | 13 |  |  |
Shares surrendered in exchange for payment of payroll tax liabilities | $ (866) |  |  | (866)
Shares surrendered in exchange for payment of payroll tax liabilities (in shares) | (23) |  |  |
Shares surrendered in exchange for exercise of stock options | $ (1,467) |  |  | (1,467)
Shares surrendered in exchange for exercise of stock options (in shares) | (39) |  |  |
Ending balance at Mar. 31, 2020 | $ 590,065 | 364,492 | (14,759) | 939,798
Ending balance (in shares) at Mar. 31, 2020 | 55,338 |  |  |
Beginning balance at Dec. 31, 2019 | $ 587,017 | 368,221 | (5,294) | $ 949,944
Beginning balance (in shares) at Dec. 31, 2019 | 55,213 |  |  | 55,213
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income (loss) |  |  |  | $ (22,212)
Other comprehensive income (loss) |  |  |  | (7,019)
Ending balance at Jun. 30, 2020 | $ 595,726 | 345,434 | (12,313) | $ 928,847
Ending balance (in shares) at Jun. 30, 2020 | 55,481 |  |  | 55,481
Beginning balance at Mar. 31, 2020 | $ 590,065 | 364,492 | (14,759) | $ 939,798
Beginning balance (in shares) at Mar. 31, 2020 | 55,338 |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income (loss) |  | (19,058) |  | (19,058)
Other comprehensive income (loss) |  |  | 2,446 | 2,446
Stock-based compensation expense | $ 3,197 |  |  | 3,197
Options exercised | $ 2,229 |  |  | 2,229
Options exercised (in shares) | 138 |  |  |
Issuance of common stock under Employee Stock Purchase Plan | $ 235 |  |  | 235
Issuance of common stock under Employee Stock Purchase Plans (in shares) | 5 |  |  |
Ending balance at Jun. 30, 2020 | $ 595,726 | $ 345,434 | $ (12,313) | $ 928,847
Ending balance (in shares) at Jun. 30, 2020 | 55,481 |  |  | 55,481

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