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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) shares in Thousands, $ in Thousands | Total | Common Stock | Additional Paid-In Capital | Retained Earnings
--- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2018 | $ 201,100 | $ 11,021 | $ 102,243 | $ 87,836
Beginning Balance (in shares) at Dec. 31, 2018 |  | 15,090 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income (loss) | (3,042) |  |  | (3,042)
Vesting of restricted stock | (714) | $ (71) | (643) |
Vesting of restricted stock (in shares) |  | 146 |  |
Stock-based compensation expense | 560 | $ 56 | 504 |
Ending Balance at Mar. 31, 2019 | 197,904 | $ 11,006 | 102,104 | 84,794
Ending Balance (in shares) at Mar. 31, 2019 |  | 15,236 |  |
Beginning Balance at Dec. 31, 2018 | 201,100 | $ 11,021 | 102,243 | 87,836
Beginning Balance (in shares) at Dec. 31, 2018 |  | 15,090 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income (loss) | (8,290) |  |  |
Ending Balance at Jun. 30, 2019 | 193,442 | $ 11,085 | 102,811 | 79,546
Ending Balance (in shares) at Jun. 30, 2019 |  | 15,236 |  |
Beginning Balance at Mar. 31, 2019 | 197,904 | $ 11,006 | 102,104 | 84,794
Beginning Balance (in shares) at Mar. 31, 2019 |  | 15,236 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income (loss) | (5,248) |  |  | (5,248)
Stock-based compensation expense | 786 | $ 79 | 707 |
Ending Balance at Jun. 30, 2019 | 193,442 | $ 11,085 | 102,811 | 79,546
Ending Balance (in shares) at Jun. 30, 2019 |  | 15,236 |  |
Beginning Balance at Dec. 31, 2019 | $ 152,685 | $ 11,119 | 103,124 | 38,442
Beginning Balance (in shares) at Dec. 31, 2019 | 15,263 | 15,263 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income (loss) | $ 5,905 |  |  | 5,905
Vesting of restricted stock | (73) | $ (8) | (65) |
Vesting of restricted stock (in shares) |  | 27 |  |
Stock-based compensation expense | 95 | $ 10 | 85 |
Ending Balance at Mar. 31, 2020 | 158,612 | $ 11,121 | 103,144 | 44,347
Ending Balance (in shares) at Mar. 31, 2020 |  | 15,290 |  |
Beginning Balance at Dec. 31, 2019 | $ 152,685 | $ 11,119 | 103,124 | 38,442
Beginning Balance (in shares) at Dec. 31, 2019 | 15,263 | 15,263 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income (loss) | $ 368 |  |  |
Ending Balance at Jun. 30, 2020 | $ 153,419 | $ 11,155 | 103,454 | 38,810
Ending Balance (in shares) at Jun. 30, 2020 | 15,309 | 15,309 |  |
Beginning Balance at Mar. 31, 2020 | $ 158,612 | $ 11,121 | 103,144 | 44,347
Beginning Balance (in shares) at Mar. 31, 2020 |  | 15,290 |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |
Net income (loss) | (5,537) |  |  | (5,537)
Vesting of restricted stock | (1) |  | (1) |
Vesting of restricted stock (in shares) |  | 19 |  |
Stock-based compensation expense | 345 | $ 34 | 311 |
Ending Balance at Jun. 30, 2020 | $ 153,419 | $ 11,155 | $ 103,454 | $ 38,810
Ending Balance (in shares) at Jun. 30, 2020 | 15,309 | 15,309 |  |

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