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CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Accumulated Deficit | Accumulated Other Comprehensive Income
--- | --- | --- | --- | --- | ---
Balance at period start (in shares) at Dec. 31, 2017 |  |  | 45,776 |  |  |
Balance at period start at Dec. 31, 2017 |  | $ 447,719 | $ 458 | $ 593,295 | $ (148,178) | $ 2,144
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock-based compensation (in shares) |  |  | 272 |  |  |
Stock-based compensation |  | 1,438 | $ 1 | 1,437 |  |
Purchase of common stock for retirement (in shares) |  |  | (29) |  |  |
Purchase of common stock for retirement |  | (543) |  | (543) |  |
Other comprehensive income (loss) |  | 0 |  |  |  |
Net income (loss) |  | 15,185 |  |  | 15,185 |
Balance at period end (in shares) at Mar. 31, 2018 |  |  | 46,019 |  |  |
Balance at period end at Mar. 31, 2018 |  | 463,799 | $ 459 | 594,189 | (132,993) | 2,144
Balance at period start (in shares) at Dec. 31, 2017 |  |  | 45,776 |  |  |
Balance at period start at Dec. 31, 2017 |  | 447,719 | $ 458 | 593,295 | (148,178) | 2,144
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) |  | 25,541 |  |  |  |
Balance at period end (in shares) at Sep. 30, 2018 |  |  | 46,009 |  |  |
Balance at period end at Sep. 30, 2018 |  | 477,406 | $ 460 | 597,439 | (122,637) | 2,144
Balance at period start (in shares) at Mar. 31, 2018 |  |  | 46,019 |  |  |
Balance at period start at Mar. 31, 2018 |  | 463,799 | $ 459 | 594,189 | (132,993) | 2,144
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock-based compensation (in shares) |  |  | (8) |  |  |
Stock-based compensation |  | 1,664 | $ 1 | 1,663 |  |
Purchase of common stock for retirement (in shares) |  |  | (3) |  |  |
Purchase of common stock for retirement |  | (21) |  | (21) |  |
Other comprehensive income (loss) |  | 0 |  |  |  |
Net income (loss) |  | 16,178 |  |  | 16,178 |
Balance at period end (in shares) at Jun. 30, 2018 |  |  | 46,008 |  |  |
Balance at period end at Jun. 30, 2018 |  | 481,620 | $ 460 | 595,831 | (116,815) | 2,144
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock-based compensation (in shares) |  |  | 15 |  |  |
Stock-based compensation |  | 1,696 |  | 1,696 |  |
Purchase of common stock for retirement (in shares) |  |  | (14) |  |  |
Purchase of common stock for retirement |  | (88) |  | (88) |  |
Other comprehensive income (loss) |  | 0 |  |  |  |
Net income (loss) |  | (5,822) |  |  | (5,822) |
Balance at period end (in shares) at Sep. 30, 2018 |  |  | 46,009 |  |  |
Balance at period end at Sep. 30, 2018 |  | 477,406 | $ 460 | 597,439 | (122,637) | 2,144
Balance at period start (in shares) at Dec. 31, 2018 |  |  | 46,984 |  |  |
Balance at period start at Dec. 31, 2018 |  | 512,329 | $ 470 | 617,937 | (108,751) | 2,673
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock for business combination (in shares) |  |  | 2,364 |  |  |
Issuance of common stock for business combination |  | 36,980 | $ 23 | 36,957 |  |
Stock-based compensation (in shares) |  |  | 246 |  |  |
Stock-based compensation |  | 1,535 | $ 3 | 1,532 |  |
Purchase of common stock for retirement (in shares) |  |  | (44) |  |  |
Purchase of common stock for retirement |  | (734) |  | (734) |  |
Net income (loss) |  | 61,092 |  |  | 61,092 |
Balance at period end (in shares) at Mar. 31, 2019 |  |  | 49,550 |  |  |
Balance at period end at Mar. 31, 2019 |  | 611,202 | $ 496 | 655,692 | (47,659) | 2,673
Balance at period start (in shares) at Dec. 31, 2018 |  |  | 46,984 |  |  |
Balance at period start at Dec. 31, 2018 |  | 512,329 | $ 470 | 617,937 | (108,751) | 2,673
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income (loss) |  | 5,370 |  |  |  |
Balance at period end (in shares) at Sep. 30, 2019 |  |  | 51,168 |  |  |
Balance at period end at Sep. 30, 2019 |  | 579,510 | $ 512 | 679,706 | (103,381) | 2,673
Balance at period start (in shares) at Mar. 31, 2019 |  |  | 49,550 |  |  |
Balance at period start at Mar. 31, 2019 |  | 611,202 | $ 496 | 655,692 | (47,659) | 2,673
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Issuance of common stock for convertible notes repurchase (in shares) | [1] |  | 1,449 |  |  |
Issuance of common stock for convertible notes repurchase, net | [1] | 17,789 | $ 14 | 17,775 |  |
Issuance of common stock for employee stock purchase plan (in shares) |  |  | 37 |  |  |
Issuance of common stock for employee stock purchase plan |  | 754 |  | 754 |  |
Stock-based compensation (in shares) |  |  | (31) |  |  |
Stock-based compensation |  | 1,550 |  | 1,550 |  |
Purchase of common stock for retirement (in shares) |  |  | (2) |  |  |
Purchase of common stock for retirement |  | (20) |  | (20) |  |
Exercise of stock options (in shares) |  |  | 21 |  |  |
Exercise of stock options |  | 119 |  | 119 |  |
Net income (loss) |  | 28,169 |  |  | 28,169 |
Balance at period end (in shares) at Jun. 30, 2019 |  |  | 51,024 |  |  |
Balance at period end at Jun. 30, 2019 |  | 659,563 | $ 510 | 675,870 | (19,490) | 2,673
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Stock-based compensation (in shares) |  |  | (20) |  |  |
Stock-based compensation |  | 1,448 |  | 1,448 |  |
Purchase of common stock for retirement (in shares) |  |  | (6) |  |  |
Purchase of common stock for retirement |  | (414) |  | (414) |  |
Exercise of stock options (in shares) |  |  | 170 |  |  |
Exercise of stock options |  | 2,804 | $ 2 | 2,802 |  |
Net income (loss) |  | (83,891) |  |  | (83,891) |
Balance at period end (in shares) at Sep. 30, 2019 |  |  | 51,168 |  |  |
Balance at period end at Sep. 30, 2019 |  | $ 579,510 | $ 512 | $ 679,706 | $ (103,381) | $ 2,673
[1] | The issuance of common stock for the repurchase of a portion of our 5.00% Convertible Senior Notes in the three months ended June 30, 2019 is presented net of a $12.3 million write-off associated with the equity component of the repurchased notes.

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