FAIR VALUE MEASUREMENTS: (Tables)

3 Months Ended

Mar. 31, 2017

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 on a recurring basis as of March 31, 2017:



	Level 1		Level 2		Total
	(in thousands)
Money market funds	$	4,098	$	—	$	4,098
Certificates of deposit	—		79,147		79,147
U.S. Government and agency securities	—		44,636		44,636
Commercial paper	—		30,316		30,316
Corporate bonds	—		89,082		89,082
Municipal bonds	—		8,635		8,635
Foreign government bonds	—		15,017		15,017
	4,098		266,833		270,931
Derivative contracts			3,398		3,398
Total financial assets	$	4,098	$	270,231	$	274,329
Derivative contracts	—		6		6
Total financial liabilities	$	—	$	6	$	6

The following table represents the fair value hierarchy of the Company's financial assets and liabilities measured at fair value on a recurring basis 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