FAIR VALUE MEASUREMENTS: (Tables)

12 Months Ended

Dec. 31, 2012

FAIR VALUE MEASUREMENTS:

Schedule of the fair value hierarchy of the Company's financial assets and liabilities measured at fair value

The following table represents the fair value hierarchy of the Company's financial assets and liabilities measured at fair value as of December 31, 2012.

	Level 1		Level 2		Total
			(in thousands)
Certificates of deposit	$	—	$	90,431	$	90,431
U.S. Government and agency securities		—		115,129		115,129
Commercial paper		—		34,947		34,947
Corporate bonds		—		61,462		61,462
Foreign government bonds		—		7,530		7,530
Forward contracts		—		2,942		2,942
Total financial assets	$	—	$	312,441	$	312,441

        The following table represents the fair value hierarchy of the Company's financial assets and liabilities measured at fair value as of December 31, 2011.

	Level 1		Level 2		Total
			(in thousands)
Money market funds	$	105,246	$	—	$	105,246
Certificates of deposit		—		50,152		50,152
U.S. Government and agency securities		—		251		251
Corporate bonds		—		5,217		5,217
Foreign government bonds		—		957		957
Total financial assets	$	105,246	$	56,577	$	161,823
Forward contracts		—		1,149		1,149
Total financial liabilities	$	—	$	1,149	$	1,149