Schedule of Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2016

Acquired Finite-Lived Intangible Assets [Line Items]

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

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

	September 30, 2016							December 31, 2015
	Gross Assets		Accumulated Amortization			Net		Gross Assets		Accumulated Amortization			Net
	(in thousands)
Core-developed technology	$	392,752	$	(370,894	)	$	21,858	$	388,981	$	(358,092	)	$	30,889
Customer contracts and relationships	236,974		(176,528		)	60,446		238,379		(168,885		)	69,494
Trademarks and trade names	64,010		(63,619		)	391		64,069		(62,571		)	1,498
Other	11,080		(11,042		)	38		11,078		(11,027		)	51
Total intangible assets	$	704,816	$	(622,083	)	$	82,733	$	702,507	$	(600,575	)	$	101,932

Summary of Intangible Asset Account Activity [Table Text Block]

A summary of intangible asset activity is as follows:

	Nine Months Ended September 30,
	2016		2015
	(in thousands)
Beginning balance, intangible assets, gross	$	702,507	$	748,148
Intangible assets acquired	—		4,827
Intangible assets impaired	—		(497		)
Effect of change in exchange rates	2,309		(41,245		)
Ending balance, intangible assets, gross	$	704,816	$	711,233

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

Estimated future annual amortization expense is as follows:

Year Ending December 31,	Estimated Annual Amortization
	(in thousands)
2016 (amount remaining at September 30, 2016)	$	6,304
2017	18,706
2018	13,015
2019	10,220
2020	8,328
Beyond 2020	26,160
Total intangible assets subject to amortization	$	82,733