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STOCK-BASED COMPENSATION (Narrative) (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
May 31, 2017 | May 31, 2010 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Shares available for purchase (in shares) |  |  | 3,500,000 |  |
Dividend yield |  |  | 0.00% | 0.00% | 0.00%
Share-based compensation expense recognized |  |  | $ 36,210 | $ 19,591 | $ 21,255
Intrinsic value, options exercised |  |  | 11,100 | 8,700 | 14,600
Cash received from option exercises and employee stock purchase plan |  |  | 6,800 | 5,200 | 6,900
Tax benefit realized from stock options exercised |  |  | 2,200 | 1,700 | 3,000
Capitalized share-based compensation cost |  |  | $ 500 | $ 400 | $ 300
2003 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock reserved for issuance (in shares) |  |  | 14,700,000 |  |
Increase in authorized shares (in shares) | 1,700,000 | 3,500,000 |  |  |
2000 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock reserved for issuance (in shares) |  |  | 4,000,000 |  |
2001 Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock reserved for issuance (in shares) |  |  | 4,000,000 |  |
Employee Stock Purchase Plan |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common stock reserved for issuance (in shares) |  |  | 3,000,000 |  |
Shares available for purchase (in shares) |  |  | 2,000,000 |  |
Shares issued (in shares) |  |  | 16,948 | 18,284 | 12,531
ESPP proceeds received |  |  | $ 1,100 | $ 1,100 | $ 700
Employee Stock Option |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  |  | 4 years |  |
Share-based compensation expense recognized |  |  | $ 5,000 | 3,200 | 3,000
Total unrecognized compensation costs related to unvested awards |  |  | $ 2,900 |  |
Weighted-average period for cost recognition, in years |  |  | 2 years |  |
Employee Stock Option | Director |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  |  | 1 year |  |
Employee Stock Option | Employee |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expiration period, in years |  |  | 8 years |  |
Employee Stock Option | Directors and Certain Executive Officers | Minimum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expiration period, in years |  |  | 6 years |  |
Employee Stock Option | Directors and Certain Executive Officers | Maximum |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Expiration period, in years |  |  | 10 years |  |
Restricted Stock Units (RSUs) |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Award vesting period |  |  | 3 years |  |
Vested but not issued (in shares) |  |  | 500,000 |  |
Restricted Stock, Performance Stock and Contract Stock |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based compensation expense recognized |  |  | $ 31,200 | 16,400 | 18,100
Total unrecognized compensation costs related to unvested awards |  |  | $ 21,100 |  |
Weighted-average period for cost recognition, in years |  |  | 2 years |  |
Fair value of shares vested |  |  | $ 15,700 | $ 17,300 | $ 21,100
Requisite service periods of performance stock, restricted stock and contract stock awards, in years |  |  | 3 years |  |
Performance Shares Units |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Vested but not issued (in shares) |  |  | 100,000 |  |

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