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CONSOLIDATED STATEMENT OF SHAREHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Deficit | Treasury Stock
--- | --- | --- | --- | --- | ---
Beginning balance at Dec. 31, 2019 | $ 402,326 | $ 157 | $ 1,177,984 | $ (592,654) | $ (183,161)
Beginning balance (in shares) at Dec. 31, 2019 |  | 15,677 |  |  | 2,641
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) and comprehensive income (loss) | 14,401 |  |  | 14,401 |
Non-cash compensation | 11,917 |  | 11,917 |  |
Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes | (5,087) |  | (5,087) |  |
Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes (in shares) |  | 27 |  |  |
Other | 0 |  | (1) | 1 |
Ending balance at Mar. 31, 2020 | 423,557 | $ 157 | 1,184,813 | (578,252) | $ (183,161)
Ending balance (in shares) at Mar. 31, 2020 |  | 15,704 |  |  | 2,641
Beginning balance at Dec. 31, 2019 | 402,326 | $ 157 | 1,177,984 | (592,654) | $ (183,161)
Beginning balance (in shares) at Dec. 31, 2019 |  | 15,677 |  |  | 2,641
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) and comprehensive income (loss) | (15,356) |  |  |  |
Ending balance at Jun. 30, 2020 | 405,977 | $ 157 | 1,196,990 | (608,009) | $ (183,161)
Ending balance (in shares) at Jun. 30, 2020 |  | 15,731 |  |  | 2,641
Beginning balance at Mar. 31, 2020 | 423,557 | $ 157 | 1,184,813 | (578,252) | $ (183,161)
Beginning balance (in shares) at Mar. 31, 2020 |  | 15,704 |  |  | 2,641
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) and comprehensive income (loss) | (29,757) |  |  | (29,757) |
Non-cash compensation | 13,158 |  | 13,158 |  |
Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes | (981) |  | (981) |  |
Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes (in shares) |  | 27 |  |  |
Ending balance at Jun. 30, 2020 | 405,977 | $ 157 | 1,196,990 | (608,009) | $ (183,161)
Ending balance (in shares) at Jun. 30, 2020 |  | 15,731 |  |  | 2,641
Beginning balance at Dec. 31, 2020 | 364,761 | $ 158 | 1,188,673 | (640,909) | $ (183,161)
Beginning balance (in shares) at Dec. 31, 2020 |  | 15,766 |  |  | 2,641
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) and comprehensive income (loss) | 19,049 |  |  | 19,049 |
Non-cash compensation | 16,436 |  | 16,436 |  |
Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes | (4,801) |  | (4,801) |  |
Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes (in shares) |  | 31 |  |  |
Other | (2) |  | (2) |  |
Ending balance at Mar. 31, 2021 | 395,443 | $ 158 | 1,200,306 | (621,860) | $ (183,161)
Ending balance (in shares) at Mar. 31, 2021 |  | 15,797 |  |  | 2,641
Beginning balance at Dec. 31, 2020 | 364,761 | $ 158 | 1,188,673 | (640,909) | $ (183,161)
Beginning balance (in shares) at Dec. 31, 2020 |  | 15,766 |  |  | 2,641
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) and comprehensive income (loss) | 25,650 |  |  |  |
Ending balance at Jun. 30, 2021 | 420,368 | $ 160 | 1,218,628 | (615,259) | $ (183,161)
Ending balance (in shares) at Jun. 30, 2021 |  | 15,956 |  |  | 2,641
Beginning balance at Mar. 31, 2021 | 395,443 | $ 158 | 1,200,306 | (621,860) | $ (183,161)
Beginning balance (in shares) at Mar. 31, 2021 |  | 15,797 |  |  | 2,641
Increase (Decrease) in Stockholders' Equity |  |  |  |  |
Net income (loss) and comprehensive income (loss) | 6,601 |  |  | 6,601 |
Non-cash compensation | 18,294 |  | 18,294 |  |
Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes | 30 | $ 2 | 28 |  |
Issuance of common stock for stock options, restricted stock awards and restricted stock units, net of withholding taxes (in shares) |  | 159 |  |  |
Ending balance at Jun. 30, 2021 | $ 420,368 | $ 160 | $ 1,218,628 | $ (615,259) | $ (183,161)
Ending balance (in shares) at Jun. 30, 2021 |  | 15,956 |  |  | 2,641

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