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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands | Total | Preferred Stock [Member] | Common Stock [Member] | Additional Paid-In Capital [Member] | Stock Notes Receivable From Employees [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member]
--- | --- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2016 | $ 258,854 | $ 0 | $ 4 | $ 85,445 | $ (4) | $ 172,599 | $ 810
Beginning Balance, Shares at Dec. 31, 2016 |  | 0 | 37,882,266 |  |  |  |
Cumulative effect of a change in accounting principle, net of tax at Dec. 31, 2016 | 33 | $ 0 | $ 0 | 85 | 0 | (52) | 0
Balance as adjusted at Dec. 31, 2016 | 258,887 | $ 0 | $ 4 | 85,530 | (4) | 172,547 | 810
Balance as adjusted, Shares at Dec. 31, 2016 |  | 0 | 37,882,266 |  |  |  |
Net and comprehensive income (loss) | 51,654 | $ 0 | $ 0 | 0 | 0 | 51,524 | 130
Stock-based compensation | 9,145 | $ 0 | $ 0 | 9,145 | 0 | 0 | 0
Stock-based compensation, Shares |  | 0 | 0 |  |  |  |
Issuance of common stock pursuant to employee stock purchase plan | 653 | $ 0 | $ 0 | 653 | 0 | 0 | 0
Issuance of common stock pursuant to employee stock purchase plan, Shares |  | 0 | 30,209 |  |  |  |
Issuance of common stock for settlement of deferred stock units | 0 | $ 0 | $ 0 | 0 | 0 | 0 | 0
Issuance of common stock for settlement of deferred stock units, Shares |  | 0 | 351,801 |  |  |  |
Issuance of common stock for vesting of restricted stock units | 0 | $ 0 | $ 0 | 0 | 0 | 0 | 0
Issuance of common stock for vesting of restricted stock units, Shares |  | 0 | 284,837 |  |  |  |
Issuance of common stock for unvested restricted stock awards | 0 | $ 0 | $ 0 | 0 | 0 | 0 | 0
Issuance of common stock for unvested restricted stock awards, Shares |  | 0 | 17,538 |  |  |  |
Shares withheld related to net share settlement of stock-based awards | (5,451) | $ 0 | $ 0 | (5,451) | 0 | 0 | 0
Shares withheld related to net share settlement of stock-based awards, shares |  | 0 | (192,640) |  |  |  |
Ending Balance at Dec. 31, 2017 | 314,888 | $ 0 | $ 4 | 89,877 | (4) | 224,071 | 940
Ending Balance, Shares at Dec. 31, 2017 |  | 0 | 38,374,011 |  |  |  |
Cumulative effect of a change in accounting principle, net of tax at Dec. 31, 2017 | 0 | $ 0 | $ 0 | 0 | 0 | 13 | (13)
Balance as adjusted at Dec. 31, 2017 | 314,888 | $ 0 | $ 4 | 89,877 | (4) | 224,084 | 927
Balance as adjusted, Shares at Dec. 31, 2017 |  | 0 | 38,374,011 |  |  |  |
Net and comprehensive income (loss) | 87,105 | $ 0 | $ 0 | 0 | 0 | 87,257 | (152)
Stock-based compensation | 11,983 | $ 0 | $ 0 | 11,983 | 0 | 0 | 0
Stock-based compensation, Shares |  | 0 | 0 |  |  |  |
Issuance of common stock pursuant to employee stock purchase plan | 621 | $ 0 | $ 0 | 621 | 0 | 0 | 0
Issuance of common stock pursuant to employee stock purchase plan, Shares |  | 0 | 21,001 |  |  |  |
Issuance of common stock for settlement of deferred stock units | 0 | $ 0 | $ 0 | 0 | 0 | 0 | 0
Issuance of common stock for settlement of deferred stock units, Shares |  | 0 | 237,052 |  |  |  |
Issuance of common stock for vesting of restricted stock units | 0 | $ 0 | $ 0 | 0 | 0 | 0 | 0
Issuance of common stock for vesting of restricted stock units, Shares |  | 0 | 317,236 |  |  |  |
Issuance of common stock for unvested restricted stock awards | 0 | $ 0 | $ 0 | 0 | 0 | 0 | 0
Issuance of common stock for unvested restricted stock awards, Shares |  | 0 | 12,852 |  |  |  |
Shares withheld related to net share settlement of stock-based awards | (5,023) | $ 0 | $ 0 | (5,023) | 0 | 0 | 0
Shares withheld related to net share settlement of stock-based awards, shares |  | 0 | (147,688) |  |  |  |
Ending Balance at Dec. 31, 2018 | 409,574 | $ 0 | $ 4 | 97,458 | (4) | 311,341 | 775
Ending Balance, Shares at Dec. 31, 2018 |  | 0 | 38,814,464 |  |  |  |
Net and comprehensive income (loss) | 78,133 | $ 0 | $ 0 | 0 | 0 | 76,930 | 1,203
Stock-based compensation | 9,278 | $ 0 | $ 0 | 9,278 | 0 | 0 | 0
Stock-based compensation, Shares |  | 0 | 0 |  |  |  |
Issuance of common stock pursuant to employee stock purchase plan | 657 | $ 0 | $ 0 | 657 | 0 | 0 | 0
Issuance of common stock pursuant to employee stock purchase plan, Shares |  | 0 | 21,421 |  |  |  |
Issuance of common stock for vesting of restricted stock units | 0 | $ 0 | $ 0 | 0 | 0 | 0 | 0
Issuance of common stock for vesting of restricted stock units, Shares |  | 0 | 378,194 |  |  |  |
Issuance of common stock for unvested restricted stock awards | 0 | $ 0 | $ 0 | 0 | 0 | 0 | 0
Issuance of common stock for unvested restricted stock awards, Shares |  | 0 | 12,806 |  |  |  |
Shares withheld related to net share settlement of stock-based awards | (2,735) | $ 0 | $ 0 | (2,735) | 0 | 0 | 0
Shares withheld related to net share settlement of stock-based awards, shares |  | 0 | (73,690) |  |  |  |
Ending Balance at Dec. 31, 2019 | $ 494,907 | $ 0 | $ 4 | $ 104,658 | $ (4) | $ 388,271 | $ 1,978
Ending Balance, Shares at Dec. 31, 2019 |  | 0 | 39,153,195 |  |  |  |

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