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TAXES ON INCOME (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Net operating losses carryforward and tax credits $ 79,196 $ 82,243
Share based payments 16,142 17,299
Research and development costs 3,606 4,246
Reserves, allowances and other 8,915 8,507
Deferred tax assets before valuation allowance 107,859 112,295
Valuation allowance (8,853) (8,839)
Deferred tax assets 99,006 103,456
Deferred tax liabilities:    
Acquired intangibles (142,352) (231,645)
Acquired deferred revenue (2,600) (4,670)
Deferred tax liabilities (144,952) (236,315)
Deferred tax liabilities, net (45,946) (132,859)
Deferred tax assets 11,850 14,093
Deferred tax liabilities (57,796) (146,952)
Deferred tax liabilities, net $ (45,946) $ (132,859)