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INVESTMENTS: (Tables)

12 Months Ended

Dec. 31, 2013

INVESTMENTS:

Schedule of cash, cash equivalents and short-term investments

		December 31, 2013
		Amortized Cost			Unrealized Gains			Unrealized Losses			Estimated Fair Value
		(in thousands)
Cash		$	43,164		$	—		$	—		$	43,164
Money market funds		20,000			—			—			20,000
Certificates of deposit		67,775			1			(7		)	67,769
U.S. Government and agency securities		69,859			22			(2		)	69,879
Commercial paper		33,602			9			(5		)	33,606
Corporate bonds		92,298			16			(40		)	92,274
Total investments		$	326,698		$	48		$	(54	)	$	326,692
Less amounts classified as cash and cash equivalents		(63,164		)	—			—			(63,164		)
		$	263,534		$	48		$	(54	)	$	263,528

		December 31, 2012
		Amortized Cost			Unrealized Gains			Unrealized Losses			Estimated Fair Value
		(in thousands)
Cash		$	110,148		$	—		$	—		$	110,148
Certificates of deposit		90,437			1			(7		)	90,431
U.S. Government and agency securities		115,179			9			(59		)	115,129
Commercial paper		34,977			—			(30		)	34,947
Corporate bonds		61,543			3			(84		)	61,462
Foreign government bonds		7,511			19			—			7,530
Total investments		$	419,795		$	32		$	(180	)	$	419,647
Less amounts classified as cash and cash equivalents		(117,054		)	—			—			(117,054		)
		$	302,741		$	32		$	(180	)	$	302,593

Schedule of contractual maturities of short-term investments

		December 31, 2013						December 31, 2012
		Amortized Cost			Estimated Fair Value			Amortized Cost			Estimated Fair Value
		(in thousands)
Due in less than one year		$	190,172		$	190,189		$	172,941		$	172,880
Due in one to three years		73,362			73,339			129,800			129,713
		$	263,534		$	263,528		$	302,741		$	302,593