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Stock Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Stock-based compensation expense, tax benefit | $ 226 | $ 121 | $ 18
Option expense | $ 1,400 | $ 500 | $ 300
Weighted average grant date fair value of options granted (in dollars per share) | $ 13.82 | $ 24.87 | $ 19.36
Total intrinsic value of options exercised | $ 1,900 | $ 5,400 | $ 1,600
Total stock-based compensation expense | 4,251 | 2,706 | 1,039
Total stock-based compensation expense included in selling, general and administrative expense | $ 4,251 | $ 2,706 | $ 1,039
Shares released (in shares) | 23,000 | 0 |
Equity Incentive Plan 2015 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares authorized under plan approved by directors (in shares) | 2,700,000 |  |
Employee Stock Options | Equity Incentive Plan 2015 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Expiration period | 10 years |  |
Employee Stock Options | Equity Incentive Plan 2015 | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 1 year |  |
Employee Stock Options | Equity Incentive Plan 2015 | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Restricted Stock |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation expense | $ 11,600 |  |
Granted (in shares) | 29,000 | 225,000 | 79,000
Total stock-based compensation expense included in selling, general and administrative expense | $ 100 |  |
Weighted average grant date fair value (in dollars per share) | $ 30.96 | $ 24.77 | $ 17.08
Shares released (in shares) | 112,000 | 13,000 | 31,000
Restricted stock awards cancelled (in shares) | 5,000 | 53,000 | 13,000
Restricted Stock | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 1 year |  |
Restricted Stock | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 3 years |  |
Restricted stock units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Unrecognized compensation expense | $ 11,600 |  |
Granted (in shares) | 383,000 | 67,000 | 0
Total stock-based compensation expense included in selling, general and administrative expense | $ 100 |  |
Weighted average grant date fair value (in dollars per share) | $ 13.80 | $ 29.73 |
Restricted stock awards cancelled (in shares) | 0 |  |
Restricted stock awards forfeited of canceled (in shares) | 0 | 0 |
Performance Shares |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Restricted stock awards cancelled (in shares) | 4,000 | 38,000 | 12,000
Performance Shares | Minimum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 1 year |  |
Performance Shares | Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Vesting period | 4 years |  |
Restricted Stock And Restricted Stock Units |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Total stock-based compensation expense | $ 2,900 | $ 2,200 | $ 700

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