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STOCK-BASED COMPENSATION (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Stock-Based Compensation Expense Included in Consolidated Statements of Operations | The following table presents the stock-based compensation expense included in the Company’s consolidated statements of operations:
(in thousands) | 2018 |  | 2017 |  | 2016
Cost of revenues | $ | 16,862 |  |  | $ | 14,573 |  |  | $ | 11,459 |
Selling and marketing | 23,237 |  |  | 15,720 |  |  | 12,464 |
Research and development | 15,274 |  |  | 13,618 |  |  | 10,043 |
General and administrative | 8,489 |  |  | 9,402 |  |  | 6,513 |
Acquisition-related | — |  |  | — |  |  | 342 |
| $ | 63,862 |  |  | $ | 53,313 |  |  | $ | 40,821 |
Income tax benefit | $ | (13,383 | ) |  | $ | (12,113 | ) |  | $ | (12,198 | )
Weighted-Average Assumptions Used in Black-Scholes Option Valuation Model | The weighted-average assumptions used in the Black-Scholes option valuation model are:
| 2018 |  | 2017 |  | 2016
Expected annual volatility (1) | 34 | % |  | 35 | % |  | 40 | %
Expected term in years (2) | 4.5 |  |  | 4.5 |  |  | 4.4 |
Risk-free interest rate (3) | 2.6 | % |  | 1.9 | % |  | 1.2 | %
Expected annual dividend yield (4) | 0.4 | % |  | 0.5 | % |  | 0.6 | %
(1) The expected annual volatility for each grant is determined based on the average of historical daily price changes of the Company’s common stock over a period which approximates the expected option term. (2) The expected option term for each grant is determined based on the historical exercise behavior of employees and post-vesting employment termination behavior. (3) The risk-free interest rate is based on the yield of U.S. Treasury securities with a maturity that is commensurate with the expected option term at the time of grant. (4) The expected annual dividend yield is based on the weighted-average of the dividend yield assumptions used for options granted during the applicable period.
Combined Stock Option Activity | The following table summarizes the combined stock option activity under the Company’s stock option plans for 2018:
| Shares (in thousands) |  | Weighted-average Exercise Price |  | Weighted-average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (in thousands)
Options outstanding as of January 1, 2018 | 7,130 |  |  | $ | 26.10 |  |  |  |  |
Granted | 1,705 |  |  | 58.42 |  |  |  |  |
Exercised | (1,422 | ) |  | 20.88 |  |  |  |  |
Forfeited | (442 | ) |  | 35.50 |  |  |  |  |
Options outstanding as of December 31, 2018 | 6,971 |  |  | $ | 34.47 |  |  |  |  |
Vested and expected to vest as December 31, 2018 | 5,841 |  |  | $ | 33.23 |  |  | 7.0 |  | $ | 99,999 |
Exercisable as of December 31, 2018 | 2,893 |  |  | $ | 22.16 |  |  | 5.7 |  | $ | 74,650 |
Combined Restricted Stock Units Activity | The following table summarizes the combined RSU activity for all grants, including the CICP, under the 2004 Plan for 2018:
| Shares (in thousands) |  | Weighted- Average Grant-Date Fair Value |  | Aggregate Intrinsic Value (in thousands)
Nonvested as of January 1, 2018 | 2,901 |  |  | $ | 31.97 |  |  |
Granted | 1,212 |  |  | 58.52 |  |  |
Vested | (1,144 | ) |  | 31.88 |  |  |
Forfeited | (318 | ) |  | 36.74 |  |  |
Nonvested as of December 31, 2018 | 2,651 |  |  | $ | 43.69 |  |  | $ | 126,781 |
Expected to vest as of December 31, 2018 | 1,938 |  |  | $ | 44.83 |  |  | $ | 92,661 |

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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