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STOCK PLANS AND SHARE BASED COMPENSATION (Stock-Based Compensation) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Stock-based compensation expense | $ 20,885 | $ 14,767 | $ 14,282
Unrecognized compensation costs | 24,612 |  |
Cost of revenues [Member] |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Stock-based compensation expense | 1,148 | 933 | 879
Research and Development Expense [Member] |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Stock-based compensation expense | 7,309 | 5,255 | 4,784
Selling and Marketing Expense [Member] |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Stock-based compensation expense | 4,489 | 3,644 | 3,540
General and Administrative Expense [Member] |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Stock-based compensation expense | $ 7,939 | 4,935 | 5,079
Stock Options [Member] |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Awards vesting period | 4 years |  |
Stock-based compensation expense | $ 200 | 700 | 1,200
Performance Based Awards [Member] |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Stock-based compensation expense | 6,400 | 300 | 500
Long-Term Performance-based Awards [Member] |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Unrecognized compensation costs | $ 2,562 |  |
Unrecognized compensation costs, period of recognition (in years) | 1 year 6 months 9 days |  |
Restricted Stock Units (RSUs) [Member] |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Awards vesting period | 4 years |  |
Stock-based compensation expense | $ 13,000 | 12,700 | 11,300
Unrecognized compensation costs | $ 21,930 |  |
Unrecognized compensation costs, period of recognition (in years) | 2 years 3 months 8 days |  |
Employee Stock [Member] |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Stock-based compensation expense | $ 1,300 | $ 1,200 | $ 1,300
Unrecognized compensation costs | $ 120 |  |
Unrecognized compensation costs, period of recognition (in years) | 31 days |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: 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 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 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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