Goodwill and Other Intangible Assets (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Dec. 31, 2011
Summary of the Company's amortizable intangible assets
Gross Carrying Amount	$ 207,900		$ 207,900		$ 191,900
Accumulated Amortization	80,600		80,600		67,900
Weighted average useful lives of amortizable intangible assets			11 years
Amortization expense	4,700	3,800	13,900	11,100
Amortization expense estimated for each of the next five fiscal years
2012	18,800		18,800
2013	16,800		16,800
2014	14,800		14,800
2015	14,300		14,300
2016	13,500		13,500
Customer relationships
Summary of the Company's amortizable intangible assets
Gross Carrying Amount	147,200		147,200		134,700
Accumulated Amortization	49,500		49,500		38,800
Weighted average useful lives of amortizable intangible assets			10 years
Proprietary technology
Summary of the Company's amortizable intangible assets
Gross Carrying Amount	45,300		45,300		41,800
Accumulated Amortization	17,700		17,700		15,300
Weighted average useful lives of amortizable intangible assets			13 years
License agreements
Summary of the Company's amortizable intangible assets
Gross Carrying Amount	6,000		6,000		6,000
Accumulated Amortization	5,100		5,100		4,600
Weighted average useful lives of amortizable intangible assets			8 years
Trade names and other
Summary of the Company's amortizable intangible assets
Gross Carrying Amount	9,400		9,400		9,400
Accumulated Amortization	$ 8,300		$ 8,300		$ 9,200
Weighted average useful lives of amortizable intangible assets			15 years