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DEFERRED COMMISSIONS | 12 Months Ended
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Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |
DEFERRED COMMISSIONS | 5. DEFERRED COMMISSIONS
| December 31,
(in thousands) | 2020 |  | 2019
Deferred commissions (1) | $ | 108,624 |  |  | $ | 85,314 |
(1) Included in other long-term assets.
(in thousands) | 2020 |  | 2019 |  | 2018
Amortization of deferred commissions (1) | $ | 33,302 |  |  | $ | 29,152 |  |  | $ | 17,271 |
(1) Included in selling and marketing expenses.

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