Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2015

Goodwill and Intangible Assets Disclosure [Abstract]

Gross Carrying Amount of Goodwill

The gross carrying amount of goodwill was as follows (in thousands):

Balance at December 31, 2014	$	702,713
Foreign exchange	(33,684		)
Balance at September 30, 2015	$	669,029

Gross Carrying Amounts and Net Book Values of Intangible Assets

The gross carrying amounts and net book values of our intangible assets were as follows (in thousands):

	September 30, 2015								December 31, 2014
	Remaining Weighted- Average Useful Life (In years)	Gross Carrying Amount		Accumulated Amortization			Net Book Value		Gross Carrying Amount		Accumulated Amortization			Net Book Value
Acquired developed technologies	12.2	$	1,350,676	$	(305,982	)	$	1,044,694	$	1,450,606	$	(259,889	)	$	1,190,717
Manufacturing contracts	2.3	12,037		(5,088		)	6,949		13,012		(3,060		)	9,952
Trademarks	—	2,891		(2,891		)	—		2,914		(2,896		)	18
Total finite-lived intangible assets		1,365,604		(313,961		)	1,051,643		1,466,532		(265,845		)	1,200,687
Acquired IPR&D assets		219,134		—			219,134		236,748		—			236,748
Total intangible assets		$	1,584,738	$	(313,961	)	$	1,270,777	$	1,703,280	$	(265,845	)	$	1,437,435

Estimated Future Amortization Costs

Based on finite-lived intangible assets recorded as of September 30, 2015, and assuming the underlying assets will not be impaired and that we will not change the expected lives of the assets, future amortization expenses were estimated as follows (in thousands):

Year Ending December 31,	Estimated Amortization   Expense
2015 (remainder)	$	24,172
2016	92,510
2017	92,510
2018	89,623
2019	89,399
Thereafter	663,429
Total	$	1,051,643