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CONDENSED 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, 2017 | $ 314,888 | $ 0 | $ 4 | $ 89,877 | $ (4) | $ 224,071 | $ 940
Beginning Balance, Shares at Dec. 31, 2017 |  | 0 | 38,374,011 |  |  |  |
Cumulative effect of a change in accounting principle 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 | 60,305 | $ 0 | $ 0 | 0 | 0 | 61,032 | (727)
Stock-based compensation | 8,919 | $ 0 | $ 0 | 8,919 | 0 | 0 | 0
Stock-based compensation, Shares |  | 0 | 0 |  |  |  |
Shares issued pursuant to employee stock purchase plan | 356 | $ 0 | $ 0 | 356 | 0 | 0 | 0
Shares issued pursuant to employee stock purchase plan, Shares |  | 0 | 13,028 |  |  |  |
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 | 305,975 |  |  |  |
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 | (1,777) | $ 0 | $ 0 | (1,777) | 0 | 0 | 0
Shares withheld related to net share settlement of stock-based awards, shares |  | 0 | (54,506) |  |  |  |
Ending Balance at Sep. 30, 2018 | 382,691 | $ 0 | $ 4 | 97,375 | (4) | 285,116 | 200
Ending Balance, Shares at Sep. 30, 2018 |  | 0 | 38,651,360 |  |  |  |
Beginning Balance at Jun. 30, 2018 | 358,897 | $ 0 | $ 4 | 94,291 | (4) | 264,262 | 344
Beginning Balance, Shares at Jun. 30, 2018 |  | 0 | 38,621,712 |  |  |  |
Net and comprehensive income | 20,710 | $ 0 | $ 0 | 0 | 0 | 20,854 | (144)
Stock-based compensation | 3,147 | $ 0 | $ 0 | 3,147 | 0 | 0 | 0
Stock-based compensation, Shares |  | 0 | 0 |  |  |  |
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 | 31,235 |  |  |  |
Shares withheld related to net share settlement of stock-based awards | (63) | $ 0 | $ 0 | (63) | 0 | 0 | 0
Shares withheld related to net share settlement of stock-based awards, shares |  | 0 | (1,587) |  |  |  |
Ending Balance at Sep. 30, 2018 | 382,691 | $ 0 | $ 4 | 97,375 | (4) | 285,116 | 200
Ending Balance, Shares at Sep. 30, 2018 |  | 0 | 38,651,360 |  |  |  |
Beginning Balance at Dec. 31, 2018 | 409,574 | $ 0 | $ 4 | 97,458 | (4) | 311,341 | 775
Beginning Balance, Shares at Dec. 31, 2018 |  | 0 | 38,814,464 |  |  |  |
Net and comprehensive income | 57,842 | $ 0 | $ 0 | 0 | 0 | 56,209 | 1,633
Stock-based compensation | 7,040 | $ 0 | $ 0 | 7,040 | 0 | 0 | 0
Stock-based compensation, Shares |  | 0 | 0 |  |  |  |
Shares issued pursuant to employee stock purchase plan | 338 | $ 0 | $ 0 | 338 | 0 | 0 | 0
Shares issued pursuant to employee stock purchase plan, Shares |  | 0 | 11,022 |  |  |  |
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 | 366,476 |  |  |  |
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 | (2,694) | $ 0 | $ 0 | (2,694) | 0 | 0 | 0
Shares withheld related to net share settlement of stock-based awards, shares |  | 0 | (72,532) |  |  |  |
Ending Balance at Sep. 30, 2019 | 472,100 | $ 0 | $ 4 | 102,142 | (4) | 367,550 | 2,408
Ending Balance, Shares at Sep. 30, 2019 |  | 0 | 39,132,236 |  |  |  |
Beginning Balance at Jun. 30, 2019 | 450,513 | $ 0 | $ 4 | 100,098 | (4) | 348,258 | 2,157
Beginning Balance, Shares at Jun. 30, 2019 |  | 0 | 39,090,861 |  |  |  |
Net and comprehensive income | 19,543 | $ 0 | $ 0 | 0 | 0 | 19,292 | 251
Stock-based compensation | 2,114 | $ 0 | $ 0 | 2,114 | 0 | 0 | 0
Stock-based compensation, Shares |  | 0 | 0 |  |  |  |
Shares issued pursuant to employee stock purchase plan | 0 | $ 0 | $ 0 | 0 | 0 | 0 | 0
Shares issued pursuant to employee stock purchase plan, Shares |  | 0 | 0 |  |  |  |
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 | 41,257 |  |  |  |
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 | 2,264 |  |  |  |
Shares withheld related to net share settlement of stock-based awards | (70) | $ 0 | $ 0 | (70) | 0 | 0 | 0
Shares withheld related to net share settlement of stock-based awards, shares |  | 0 | (2,146) |  |  |  |
Ending Balance at Sep. 30, 2019 | $ 472,100 | $ 0 | $ 4 | $ 102,142 | $ (4) | $ 367,550 | $ 2,408
Ending Balance, Shares at Sep. 30, 2019 |  | 0 | 39,132,236 |  |  |  |

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