Schedule of Intangible Assets (Tables)

12 Months Ended

Dec. 31, 2018

Intangible Assets, Net (Excluding Goodwill) [Abstract]

Schedule of Finite-Lived Intangible Assets

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

	December 31, 2018									December 31, 2017
	Gross Assets			Accumulated (Amortization) Accretion			Net			Gross Assets		Accumulated (Amortization) Accretion			Net
	(in thousands)
Intangible Assets
Core-developed technology	$	507,100		$	(429,955	)	$	77,145		$	429,548	$	(399,969	)	$	29,579
Customer contracts and relationships	379,614			(212,538		)	167,076			258,586		(197,582		)	61,004
Trademarks and trade names	78,746			(69,879		)	8,867			70,056		(66,004		)	4,052
Other	12,600			(11,205		)	1,395			11,661		(11,068		)	593
Total intangible assets subject to amortization	978,060			(723,577		)	254,483			769,851		(674,623		)	95,228
In-process research and development	3,100						3,100			—					—
Total intangible assets	$	981,160		$	(723,577	)	$	257,583		$	769,851	$	(674,623	)	$	95,228
Intangible Liabilities
Customer contracts and relationships	$	(23,900	)	$	5,217		$	(18,683	)	$	—	$	—		$	—

Summary Of Intangible Asset Account Activity

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

	Year Ended December 31,
	2018			2017
	(in thousands)
Beginning balance, intangible assets, gross	$	769,851		$	669,896
Intangible assets acquired	242,039			36,500
Effect of change in exchange rates	(30,730		)	63,455
Ending balance, intangible assets, gross	$	981,160		$	769,851
Beginning balance, intangible liabilities, gross	$	—		$	—
Intangible liabilities acquired	(23,900		)	—
Effect of change in exchange rates	—			—
Ending balance, intangible liabilities, gross	$	(23,900	)	$	—

Finite-lived Intangible Assets Amortization Expense

A summary of intangible asset amortization expense is as follows:

	Year Ended December 31,
	2018		2017		2016
	(in thousands)
Amortization expense	$	71,713	$	20,785	$	25,112

Schedule of Finite-Lived Intangible Assets, Future Amortization Expense

Estimated future annual amortization (accretion) is as follows:

Year Ending December 31,	Amortization		Accretion			Estimated Annual Amortization, net
	(in thousands)
2019	$	72,512	$	(8,233	)	$	64,279
2020	52,591		(8,028		)	44,563
2021	37,124		(1,963		)	35,161
2022	26,950		(459		)	26,491
2023	19,363		—			19,363
Beyond 2023	45,943		—			45,943
Total intangible assets subject to amortization	$	254,483	$	(18,683	)	$	235,800