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Employee Benefits And Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |
Classification Of Stock-Based Compensation | The following table presents the classification of stock-based compensation:
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
| (In thousands)
Cost of revenues | $ | 6,835 |  |  | $ | 7,030 |  |  | $ | 7,253 |
Sales and marketing | 4,972 |  |  | 5,688 |  |  | 5,738 |
Research and development | 6,728 |  |  | 6,113 |  |  | 6,739 |
General and administrative | 33,969 |  |  | 34,076 |  |  | 30,314 |
Total stock-based compensation | $ | 52,504 |  |  | $ | 52,907 |  |  | $ | 50,044 |
Nature Of Total Stock-Based Compensation | The following table presents the nature of the Company’s total stock-based compensation:
| Year Ended December 31,
| 2018 |  | 2017 |  | 2016
| (In thousands)
RSUs | $ | 38,005 |  |  | $ | 38,087 |  |  | $ | 37,325 |
PSUs | 12,403 |  |  | 13,270 |  |  | 11,512 |
ESPP | 4,166 |  |  | 4,005 |  |  | 3,593 |
Capitalization (Included in Property and equipment, net) | (2,070 | ) |  | (2,455 | ) |  | (2,386 | )
Total stock-based compensation expenses | $ | 52,504 |  |  | $ | 52,907 |  |  | $ | 50,044 |
Summary Of Unvested RSUs Activity | The following table summarizes unvested RSUs activity for the year ended December 31, 2018:
| Shares |  | Weighted-Average Grant-Date Fair Value
| (Shares in thousands)
Unvested at beginning of period | 1,588 |  |  | $ | 74.69 |
Granted | 474 |  |  | $ | 112.74 |
PSU achievement adjustment | 115 |  |  | $ | 38.10 |
Vested and settled | (862 | ) |  | $ | 66.37 |
Forfeited | (93 | ) |  | $ | 88.43 |
| 1,222 |  |  | $ | 90.88 |

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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + 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 (h)(1) -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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the changes in outstanding nonvested restricted stock units. + 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 (c)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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