Schedule of Intangible Assets (Tables)

3 Months Ended

Mar. 31, 2018

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Schedule of Intangible Assets by Major Class [Table Text Block]

The gross carrying amount and accumulated amortization (accretion) of our intangible assets and liabilities, other than goodwill, were as follows:

	March 31, 2018									December 31, 2017
	Gross			Accumulated (Amortization) Accretion			Net			Gross		Accumulated (Amortization) Accretion			Net
	(in thousands)
Intangible Assets
Core-developed technology	$	531,263		$	(423,634	)	$	107,629		$	429,548	$	(399,969	)	$	29,579
Customer contracts and relationships	400,566			(210,757		)	189,809			258,586		(197,582		)	61,004
Trademarks and trade names	82,337			(68,982		)	13,355			70,056		(66,004		)	4,052
Other	11,664			(11,073		)	591			11,661		(11,068		)	593
Total intangible assets subject to amortization	$	1,025,830		$	(714,446	)	$	311,384		$	769,851	$	(674,623	)	$	95,228
In-process research and development	7,600			—			7,600			—		—			—
Total intangible assets	$	1,033,430		$	(714,446	)	$	318,984		$	769,851	$	(674,623	)	$	95,228
Intangible Liabilities
Customer contracts and relationships	$	(23,900	)	$	1,304		$	(22,596	)	$	—	$	—		$	—

Summary of Intangible Asset Account Activity [Table Text Block]

A summary of intangible assets and liabilities activity is as follows:

	Three Months Ended March 31,
	2018			2017
	(in thousands)
Beginning balance, intangible assets, gross	$	769,851		$	669,896
Intangible assets acquired	240,600			—
Effect of change in exchange rates	22,979			16,168
Ending balance, intangible assets, gross	$	1,033,430		$	686,064
Beginning balance, intangible liabilities, gross	$	—		$	—
Intangible liabilities acquired	(23,900		)	—
Effect of change in exchange rates	—			—
Ending balance, intangible liabilities, gross	$	(23,900	)	$	—

Schedule of Intangible Assets, Future Amortization Expense [Table Text Block]

Estimated future annual amortization (accretion) is as follows:

Year Ending December 31,	Amortization		Accretion			Estimated Annual Amortization, net
	(in thousands)
2018 (amount remaining at March 31, 2018)	$	58,564	$	(3,913	)	$	54,651
2019	72,345		(8,233		)	64,112
2020	52,265		(8,028		)	44,237
2021	36,649		(1,963		)	34,686
2022	26,317		(459		)	25,858
Beyond 2022	65,244		—			65,244
Total intangible assets subject to amortization (accretion)	$	311,384	$	(22,596	)	$	288,788