Intangible Assets Gross Carrying Amount and Accumulated Amortization (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2012
Intangible Assets [Line Items]
Gross Assets	$ 800,703	$ 804,281	$ 784,146	$ 802,540
Accumulated Amortization	(627,776)	(608,441)
Net	172,927	195,840
Core-developed technology [Member]
Intangible Assets [Line Items]
Gross Assets	426,732	428,890
Accumulated Amortization	(366,898)	(356,017)
Net	59,834	72,873
Customer contracts and relationships [Member]
Intangible Assets [Line Items]
Gross Assets	289,640	291,185
Accumulated Amortization	(181,738)	(173,952)
Net	107,902	117,233
Trademarks and trade names [Member]
Intangible Assets [Line Items]
Gross Assets	72,745	73,117
Accumulated Amortization	(68,117)	(67,449)
Net	4,628	5,668
Other [Member]
Intangible Assets [Line Items]
Gross Assets	11,586	11,089
Accumulated Amortization	(11,023)	(11,023)
Net	$ 563	$ 66