Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2014

Fair Value Measurements

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 June 30, 2014:
U.S. government securities	$	23,553	$	—	$	—	$	23,553
U.S. government agency securities	—		54,722		—		54,722
U.S. corporate notes	—		33,628		—		33,628
U.S. commercial paper	—		34,942		—		34,942
Equity securities	13,925		—		—		13,925
Money market funds	185,830		—		—		185,830
Total assets measured at estimated fair value	$	223,308	$	123,292	$	—	$	346,600
Liabilities at June 30, 2014:
Convertible subordinated notes due 2023	$	—	$	417,148	$	—	$	417,148
Non-recourse notes due 2029	—		454,500		—		454,500
Total fair value of liabilities	$	—	$	871,648	$	—	$	871,648

	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