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DEFERRED CONTRACT COSTS | 12 Months Ended
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Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |
DEFERRED CONTRACT COSTS | 5. DEFERRED CONTRACT COSTS
| December 31,
(in thousands) | 2019 |  | 2018
Deferred contract costs (1) | $ | 85,314 |  |  | $ | 64,367 |
(1) Included in other long-term assets. Amortization of deferred contract costs was as follows:
(in thousands) | 2019 |  | 2018 |  | 2017
Amortization of deferred contract costs (1) | $ | 29,152 |  |  | $ | 17,271 |  |  | $ | 12,106 |
(1) Included in selling and marketing expenses.

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