Intangible Assets Schedule of Intangible Assets (Tables)

3 Months Ended

Mar. 31, 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:

	March 31, 2016							December 31, 2015
	Gross Assets		Accumulated Amortization			Net		Gross Assets		Accumulated Amortization			Net
	(in thousands)
Core-developed technology	$	393,957	$	(365,728	)	$	28,229	$	388,981	$	(358,092	)	$	30,889
Customer contracts and relationships	239,560		(172,592		)	66,968		238,379		(168,885		)	69,494
Trademarks and trade names	64,385		(63,243		)	1,142		64,069		(62,571		)	1,498
Other	11,079		(11,032		)	47		11,078		(11,027		)	51
Total intangible assets	$	708,981	$	(612,595	)	$	96,386	$	702,507	$	(600,575	)	$	101,932

Summary of Intangible Asset Account Activity [Table Text Block]

A summary of intangible asset activity is as follows:

	Three Months Ended March 31,
	2016		2015
	(in thousands)
Beginning balance, intangible assets, gross	$	702,507	$	748,148
Intangible assets impaired	—		(497		)
Effect of change in exchange rates	6,474		(42,038		)
Ending balance, intangible assets, gross	$	708,981	$	705,613

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 March 31, 2016)	$	19,031
2017	18,841
2018	13,132
2019	10,325
2020	8,423
Beyond 2020	26,634
Total intangible assets subject to amortization	$	96,386