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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands | Total | Common Stock | Additional Paid-in Capital | Retained Earnings
--- | --- | --- | --- | ---
Balance at beginning of period (in shares) at Dec. 31, 2019 |  | 20,643,738 |  |
Balance at beginning of period at Dec. 31, 2019 | $ 936,690 | $ 4,284 | $ 702,173 | $ 230,233
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Restricted common stock issued (in shares) |  | 13,674 |  |
Stock used for tax withholdings (in shares) |  | (2,330) |  |
Stock used for tax withholdings | (61) |  | (61) |
Stock-based compensation | 1,239 |  | 1,239 |
Net income (loss) | 78,551 |  |  | 78,551
Balance at end of period (in shares) at Mar. 31, 2020 |  | 20,655,082 |  |
Balance at end of period at Mar. 31, 2020 | 1,016,419 | $ 4,284 | 703,351 | 308,784
Balance at beginning of period (in shares) at Dec. 31, 2019 |  | 20,643,738 |  |
Balance at beginning of period at Dec. 31, 2019 | 936,690 | $ 4,284 | 702,173 | 230,233
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income (loss) | 42,900 |  |  |
Balance at end of period (in shares) at Sep. 30, 2020 |  | 20,834,028 |  |
Balance at end of period at Sep. 30, 2020 | 982,952 | $ 4,282 | 705,537 | 273,133
Balance at beginning of period (in shares) at Mar. 31, 2020 |  | 20,655,082 |  |
Balance at beginning of period at Mar. 31, 2020 | 1,016,419 | $ 4,284 | 703,351 | 308,784
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Restricted common stock issued (in shares) |  | 228,149 |  |
Stock used for tax withholdings (in shares) |  | (56,904) |  |
Stock used for tax withholdings | (953) | $ (2) | (951) |
Stock-based compensation | 1,474 |  | 1,474 |
Net income (loss) | (38,902) |  |  | (38,902)
Balance at end of period (in shares) at Jun. 30, 2020 |  | 20,826,327 |  |
Balance at end of period at Jun. 30, 2020 | 978,038 | $ 4,282 | 703,874 | 269,882
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Restricted common stock issued (in shares) |  | 10,849 |  |
Stock used for tax withholdings (in shares) |  | (3,148) |  |
Stock used for tax withholdings | (60) |  | (60) |
Stock-based compensation | 1,723 |  | 1,723 |
Net income (loss) | 3,251 |  |  | 3,251
Balance at end of period (in shares) at Sep. 30, 2020 |  | 20,834,028 |  |
Balance at end of period at Sep. 30, 2020 | 982,952 | $ 4,282 | 705,537 | 273,133
Balance at beginning of period (in shares) at Dec. 31, 2020 |  | 20,839,227 |  |
Balance at beginning of period at Dec. 31, 2020 | 1,045,252 | $ 4,282 | 707,209 | 333,761
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Restricted common stock issued (in shares) |  | 109 |  |
Stock used for tax withholdings (in shares) |  | (38) |  |
Exercise of stock options (in shares) |  | 429 |  |
Exercise of stock options | 15 |  | 15 |
Stock-based compensation | 1,612 |  | 1,612 |
Net income (loss) | (119) |  |  | (119)
Balance at end of period (in shares) at Mar. 31, 2021 |  | 20,839,727 |  |
Balance at end of period at Mar. 31, 2021 | 1,046,760 | $ 4,282 | 708,836 | 333,642
Balance at beginning of period (in shares) at Dec. 31, 2020 |  | 20,839,227 |  |
Balance at beginning of period at Dec. 31, 2020 | 1,045,252 | $ 4,282 | 707,209 | 333,761
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income (loss) | 15,221 |  |  |
Balance at end of period (in shares) at Sep. 30, 2021 |  | 30,858,813 |  |
Balance at end of period at Sep. 30, 2021 | 1,417,250 | $ 4,378 | 1,085,968 | 326,904
Balance at beginning of period (in shares) at Mar. 31, 2021 |  | 20,839,727 |  |
Balance at beginning of period at Mar. 31, 2021 | $ 1,046,760 | $ 4,282 | 708,836 | 333,642
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Issuance pursuant to acquisition (in shares) | 9,802,166 |  |  |
Issuance pursuant to acquisition | $ 374,933 | $ 98 | 374,835 |
Restricted common stock issued (in shares) |  | 261,539 |  |
Stock used for tax withholdings (in shares) |  | (70,330) |  |
Stock used for tax withholdings | (2,816) | $ (2) | (2,814) |
Exercise of stock options (in shares) |  | 11,523 |  |
Exercise of stock options | 394 |  | 394 |
Stock-based compensation | 2,195 |  | 2,195 |
Dividends declared | (11,033) |  |  | (11,033)
Net income (loss) | (25,319) |  |  | (25,319)
Balance at end of period (in shares) at Jun. 30, 2021 |  | 30,844,625 |  |
Balance at end of period at Jun. 30, 2021 | 1,385,114 | $ 4,378 | 1,083,446 | 297,290
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Restricted common stock issued (in shares) |  | 5,987 |  |
Stock used for tax withholdings (in shares) |  | (1,725) |  |
Stock used for tax withholdings | (74) |  | (74) |
Exercise of stock options (in shares) |  | 9,926 |  |
Exercise of stock options | 307 |  | 307 |
Stock-based compensation | 2,289 |  | 2,289 |
Dividends declared | (11,045) |  |  | (11,045)
Net income (loss) | 40,659 |  |  | 40,659
Balance at end of period (in shares) at Sep. 30, 2021 |  | 30,858,813 |  |
Balance at end of period at Sep. 30, 2021 | $ 1,417,250 | $ 4,378 | $ 1,085,968 | $ 326,904

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