Available-for-Sale Securities and Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2014

Available For Sale Securities And Fair Value Measurements Abstract

Schedule of available-for-sale securities

(In thousands)	September 30, 2014		December 31, 2013
Cash and cash equivalents	$	119,022	$	125,009
Short-term marketable securities	143,536		321,615
Marketable securities	47,752		55,374
Restricted cash	6,433		833
Total	$	316,743	$	502,831

Schedule of amortized cost and estimated fair values for available-for-sale securities

	September 30, 2014
(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
U.S. government securities	$	33,526	$	39	$	(1	)	$	33,564
U.S. government agencies	43,611		9		(6		)	43,614
U.S. corporate notes	59,644		9		(46		)	59,607
U.S. commercial paper	44,434		—		—			44,434
Equity securities	10,269		—		(201		)	10,068
Money market funds	125,456		—		—			125,456
Total	$	316,940	$	57	$	(254	)	$	316,743

	December 31, 2013
(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Estimated Fair Value
U.S. government securities	$	42,104	$	55	$	(1	)	$	42,158
U.S. government agencies	141,278		61		(8		)	141,331
U.S. corporate notes	94,923		54		—			94,977
U.S. commercial paper	102,021		2		(1		)	102,022
Money market funds	122,343		—		—			122,343
Total	$	502,669	$	172	$	(10	)	$	502,831

Schedule of estimated fair values

	Estimated Fair Value Measurements at Reporting Date Using:
Types of Instruments	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
(In thousands)	Level 1		Level 2		Level 3		Total
Assets at September 30, 2014:
U.S. government securities	$	33,564	$	—	$	—	$	33,564
U.S. government agency securities	—		43,614		—		43,614
U.S. corporate notes	—		59,607		—		59,607
U.S. commercial paper	—		44,434		—		44,434
Equity securities	10,068		—		—		10,068
Money market funds	125,456		—		—		125,456
Total assets measured at estimated fair value	$	169,088	$	147,655	$	—	$	316,743
Liabilities at September 30, 2014:
Convertible subordinated notes due 2023	$	—	$	239,339	$	—	$	239,339
Non-recourse notes due 2029	—		454,500		—		454,500
Total fair value of liabilities	$	—	$	693,839	$	—	$	693,839

	Estimated Fair Value Measurements at Reporting Date Using
Types of Instruments	Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Unobservable Inputs
(In thousands)	Level 1		Level 2		Level 3		Total
Assets at December 31, 2013:
U.S. government securities	$	42,158	$	—	$	—	$	42,158
U.S. government agency securities	98,236		43,095		—		141,331
U.S. corporate notes	61,591		33,386		—		94,977
U.S. commercial paper	3,499		98,523		—		102,022
Money market funds	122,343		—		—		122,343
Total assets measured at estimated fair value	$	327,827	$	175,004	$	—	$	502,831
Liabilities at December 31, 2013:
Convertible subordinated notes due 2023	$	—	$	408,250	$	—	$	408,250