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STOCK-BASED COMPENSATION | 6 Months Ended
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Jun. 30, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
STOCK-BASED COMPENSATION | STOCK-BASED COMPENSATION Expense
| Three Months Ended June 30, |  | Six Months Ended June 30,
(in thousands) | 2019 |  | 2018 |  | 2019 |  | 2018
Cost of revenues | $ | 4,911 |  |  | $ | 4,257 |  |  | $ | 9,430 |  |  | $ | 7,958 |
Selling and marketing | 8,364 |  |  | 6,038 |  |  | 15,738 |  |  | 10,696 |
Research and development | 4,572 |  |  | 3,802 |  |  | 9,132 |  |  | 7,439 |
General and administrative | 2,200 |  |  | 1,959 |  |  | 4,097 |  |  | 5,072 |
| $ | 20,047 |  |  | $ | 16,056 |  |  | $ | 38,397 |  |  | $ | 31,165 |
Income tax benefit | $ | (4,056 | ) |  | $ | (3,341 | ) |  | $ | (7,796 | ) |  | $ | (6,482 | )
As of June 30, 2019, the Company had $99.5 million of unrecognized stock-based compensation expense, net of estimated forfeitures, which is expected to be recognized over a weighted-average period of 2.2 years. Grants The Company granted the following stock-based compensation awards:
| Six Months Ended June 30, 2019
(in thousands) | Shares |  | Total Fair Value
RSUs | 949 |  |  | $ | 60,855 |
Non-qualified stock options | 1,828 |  |  | $ | 34,481 |
Vestings and exercises During the six months ended June 30, 2019, 0.8 million shares of common stock were issued due to stock option exercises and RSU vestings under the Company’s stock-based compensation plans.

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- Definition The entire disclosure for compensation-related costs for equity-based compensation, which may include disclosure of policies, compensation plan details, allocation of equity compensation, incentive distributions, equity-based arrangements to obtain goods and services, deferred compensation arrangements, employee stock ownership plan details and employee stock purchase plan details. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -URI http://asc.fasb.org/topic&trid=2228938 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -URI http://asc.fasb.org/subtopic&trid=2208855 + Details
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