FAIR VALUE MEASUREMENTS: (Tables)

12 Months Ended

Dec. 31, 2016

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, 2016.



	Level 1		Level 2		Total
	(in thousands)
Money market funds	$	1,833	$	—	$	1,833
Certificates of deposit	—		78,643		78,643
U.S. Government and agency securities	—		56,347		56,347
Commercial paper	—		29,483		29,483
Corporate bonds	—		94,162		94,162
Municipal bonds	—		7,706		7,706
Foreign government bonds	—		5,320		5,320
	1,833		271,661		273,494
Derivative contracts	—		257		257
Total financial assets	$	1,833	$	271,918	$	273,751
Derivative contracts	$	—	$	1,006	$	1,006
Total financial liabilities	$	—	$	1,006	$	1,006

The following table represents the fair value hierarchy of the Company's financial assets and liabilities measured at fair value as of December 31, 2015.



	Level 1		Level 2		Total
	(in thousands)
Certificates of deposit	$	—	$	110,423	$	110,423
U.S. Government and agency securities	—		131,722		131,722
Commercial paper	—		57,214		57,214
Corporate bonds	—		105,482		105,482
Municipal bonds	—		26,208		26,208
Foreign government bonds	—		13,940		13,940
Total financial assets	$	—	$	444,989	$	444,989
Derivative contracts	$	—	$	1,157	$	1,157
Total financial liabilities	$	—	$	1,157	$	1,157