FAIR VALUE MEASUREMENTS: (Tables)

3 Months Ended

Mar. 31, 2015

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 March 31, 2015.

	Level 1		Level 2		Total
	(in thousands)
Money market funds	$	869	$	—	$	869
Certificates of deposit	—		91,377		91,377
U.S. Government and agency securities	—		102,531		102,531
Commercial paper	—		17,965		17,965
Corporate bonds	—		120,369		120,369
Municipal bonds	—		25,161		25,161
Foreign government bonds	—		12,065		12,065
Total financial assets	$	869	$	369,468	$	370,337
Derivative contracts	—		3,272		3,272
Total financial liabilities	$	—	$	3,272	$	3,272

The following table represents the fair value hierarchy of the Company’s financial assets and liabilities measured at fair value as of December 31, 2014.

	Level 1		Level 2		Total
	(in thousands)
Money market funds	$	4,426	$	—	$	4,426
Certificates of deposit	—		80,275		80,275
U.S. Government and agency securities	—		99,114		99,114
Commercial paper	—		23,019		23,019
Corporate bonds	—		111,736		111,736
Municipal bonds	—		13,104		13,104
Foreign government bonds	—		6,790		6,790
Total financial assets	$	4,426	$	334,038	$	338,464
Derivative contracts	—		3,562		3,562
Total financial liabilities	$	—	$	3,562	$	3,562