Goodwill and Other Intangible Assets (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 Y	Dec. 31, 2010
Summary of the Company's amortizable intangible assets
Gross Carrying Amount	$ 191,900	$ 159,100
Accumulated Amortization	67,900	51,500
Weighted average useful lives of amortizable intangible assets (in years)	11
Amortization expense	15,200	14,000
Amortization expense estimated for each of the next five fiscal years
2012	17,700
2013	14,500
2014	12,600
2015	12,100
2016	11,200
Customer relationships
Summary of the Company's amortizable intangible assets
Gross Carrying Amount	134,700	104,100
Accumulated Amortization	38,800	27,800
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	39,800
Accumulated Amortization	15,300	12,100
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	4,600	3,800
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	9,200
Accumulated Amortization	$ 9,200	$ 7,800
Weighted average useful lives of amortizable intangible assets (in years)	15