Goodwill and Other Intangible Assets (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 Y	Mar. 31, 2011	Dec. 31, 2011
Summary of the Company's amortizable intangible assets
Gross Carrying Amount	$ 193,300		$ 191,900
Accumulated Amortization	71,300		67,900
Weighted average useful lives of amortizable intangible assets (in years)	11
Amortization expense	4,500	3,300
Amortization expense estimated for each of the next five fiscal years
2012	17,800
2013	14,600
2014	12,700
2015	12,200
2016	11,400
Customer relationships
Summary of the Company's amortizable intangible assets
Gross Carrying Amount	136,100		134,700
Accumulated Amortization	42,200		38,800
Weighted average useful lives of amortizable intangible assets (in years)	10
Proprietary technology
Summary of the Company's amortizable intangible assets
Gross Carrying Amount	41,800		41,800
Accumulated Amortization	16,100		15,300
Weighted average useful lives of amortizable intangible assets (in years)	14
License agreements
Summary of the Company's amortizable intangible assets
Gross Carrying Amount	6,000		6,000
Accumulated Amortization	4,800		4,600
Weighted average useful lives of amortizable intangible assets (in years)	8
Trade names and other
Summary of the Company's amortizable intangible assets
Gross Carrying Amount	9,400		9,400
Accumulated Amortization	$ 8,200		$ 9,200
Weighted average useful lives of amortizable intangible assets (in years)	15