INCOME TAXES: (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Components of income (loss) before income taxes
United States	$ (2,463,000)	$ 6,343,000	$ 3,550,000
Foreign	(17,127,000)	113,795,000	10,159,000
Income (loss) before taxes on income	(19,590,000)	120,138,000	13,709,000
Current:
U.S. federal	1,989,000	6,178,000	2,838,000
State and local	508,000	890,000	437,000
Foreign	3,110,000	4,573,000	907,000
Total current	5,607,000	11,641,000	4,182,000
Deferred:
U.S. federal	(1,174,000)	(2,805,000)	(658,000)
State and local	(219,000)	(226,000)	(149,000)
Foreign	(462,000)	(423,000)
Total deferred	(1,855,000)	(3,454,000)	(807,000)
Provision for taxes on income	3,752,000	8,187,000	3,375,000
Deferred tax assets:
Net operating loss and credit carryforwards	44,706,000	30,644,000
Reserves and accruals	8,961,000	7,499,000
Depreciation and amortization	942,000	(174,000)
Other	2,285,000
Gross deferred tax assets	56,894,000	37,969,000
Valuation allowance	(27,365,000)	(28,039,000)
Total deferred tax assets	29,529,000	9,930,000
Intangible assets	(15,038,000)	(4,034,000)
Total deferred tax liabilities	(15,038,000)	(4,034,000)
Net deferred tax assets	14,491,000	5,896,000
Non-Israeli subsidiaries' undistributed earnings	11,700,000
Reconciliation of the statutory federal income tax rate to the Company's effective tax rate
Tax at statutory rate (as a percent)	35.00%	35.00%	34.00%
State, net of federal benefit (as a percent)	2.90%	0.50%	2.20%
Meals and entertainment (as a percent)	(1.90%)	0.10%	0.40%
Tax at rates other than the statutory rate (as a percent)	(35.70%)	(32.90%)	(15.60%)
Share-based compensation (as a percent)	(4.60%)	(0.10%)	3.20%
Net change in tax reserves (as a percent)	(15.90%)	4.80%
Other, net (as a percent)	(0.50%)	(0.60%)	0.40%
Provision for taxes (as a percent)	(19.20%)	6.80%	24.60%
Tax benefits recognized to additional paid in capital (APIC) pool	2,700,000	5,100,000
Income tax holiday
Corporate tax rate in 2013 (as a percent)	25.00%
Corporate tax rate in 2014 (as a percent)	26.50%
Summary of the activity related to the Company's unrecognized tax benefits
Unrecognized tax benefits which would reduce the Company's income tax expense and effective tax rate, if recognized	23,600,000	9,700,000
Gross unrecognized tax benefits, beginning of the period	9,716,000	4,063,000
Increases in tax positions for prior years	444,000	120,000
Decreases in tax positions for prior years	(11,000)
Increases in tax positions for current year	3,029,000	5,533,000
Decreases in tax positions for current year	(630,000)
Increase in tax positions acquired or assumed in a business combination	11,037,000
Gross unrecognized tax benefits, end of the period	23,585,000	9,716,000	4,063,000
Total amount of accrued interest or penalties related to unrecognized tax benefit or tax contingencies	600,000	400,000	200,000
Ministry of Industry Trade and Labor
Income tax holiday
Cash tax savings due to tax holiday	6,400,000	33,200,000
Increase in diluted earnings per share	$ 0.15	$ 0.76
Ministry of Industry Trade and Labor | Yokneam
Income tax holiday
Period of tax holiday	10 years
Ministry of Industry Trade and Labor | Tel-Aviv
Income tax holiday
Period of tax holiday	2 years
Reduced income tax rate after second year of tax holiday (as a percent)	10.00%
Ministry of Industry Trade and Labor | Tel-Aviv | Minimum
Income tax holiday
Period for which reduced income tax rates are applicable beginning from fiscal year 2013	5 years
Ministry of Industry Trade and Labor | Tel-Aviv | Maximum
Income tax holiday
Period for which reduced income tax rates are applicable beginning from fiscal year 2013	8 years
Israel
Income tax holiday
Foreign net operating loss carryforwards	82,100,000
United States
Income tax holiday
Foreign net operating loss carryforwards	61,200,000
Denmark
Income tax holiday
Foreign net operating loss carryforwards	$ 14,200,000