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Employee Benefits And Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2017
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,
| 2017 |  | 2016 |  | 2015
| (In thousands)
Cost of revenues | $ | 7,030 |  |  | $ | 7,253 |  |  | $ | 7,009 |
Sales and marketing | 5,688 |  |  | 5,738 |  |  | 6,763 |
Research and development | 6,113 |  |  | 6,739 |  |  | 6,488 |
General and administrative | 34,076 |  |  | 30,314 |  |  | 25,815 |
Total stock-based compensation | $ | 52,907 |  |  | $ | 50,044 |  |  | $ | 46,075 |
Nature Of Total Stock-Based Compensation | The following table presents the nature of the Company’s total stock-based compensation:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
| (In thousands)
RSUs | $ | 38,087 |  |  | $ | 37,325 |  |  | $ | 36,664 |
Performance-based RSUs | 13,270 |  |  | 11,512 |  |  | 8,078 |
ESPP | 4,005 |  |  | 3,593 |  |  | 4,051 |
Capitalization (Included in Property and equipment, net) | (2,455 | ) |  | (2,386 | ) |  | (2,718 | )
Total stock-based compensation expenses | $ | 52,907 |  |  | $ | 50,044 |  |  | $ | 46,075 |
Summary Of Unvested RSUs Activity | The following table summarizes unvested RSUs activity:
| Year Ended December 31,
| 2017 |  | 2016 |  | 2015
Shares |  | Weighted-Average Grant-Date Fair Value |  | Shares |  | Weighted-Average Grant-Date Fair Value |  | Shares |  | Weighted-Average Grant-Date Fair Value
| (Shares in thousands)
Unvested at beginning of period | 1,846 |  |  | $ | 66.30 |  |  | 2,110 |  |  | $ | 54.77 |  |  | 2,179 |  |  | $ | 46.36 |
Granted | 732 |  |  | 79.94 |  |  | 760 |  |  | 78.58 |  |  | 1,075 |  |  | 61.74 |
Vested and settled | (885 | ) |  | 61.75 |  |  | (873 | ) |  | 49.95 |  |  | (932 | ) |  | 43.92 |
Forfeited | (105 | ) |  | 72.90 |  |  | (151 | ) |  | 61.57 |  |  | (212 | ) |  | 51.47 |
| 1,588 |  |  | $ | 74.69 |  |  | 1,846 |  |  | $ | 66.30 |  |  | 2,110 |  |  | $ | 54.77 |

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- Definition Tabular disclosure of the amount of total share-based compensation cost, including the amounts attributable to each share-based compensation plan and any related tax benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=27013229&loc=d3e301413-122809 + Details
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