Goodwill and Other Intangible Assets (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012 year	Jun. 30, 2011	Dec. 31, 2011
Summary of the Company's amortizable intangible assets
Gross Carrying Amount	$ 198,400		$ 198,400		$ 191,900
Accumulated Amortization	75,900		75,900		67,900
Weighted average useful lives of amortizable intangible assets (in years)			11
Amortization expense	4,700	3,800	9,200	7,400
Amortization expense estimated for each of the next five fiscal years
2012			18,300
2013			15,400
2014			13,500
2015			13,000
2016			12,200
Customer relationships
Summary of the Company's amortizable intangible assets
Gross Carrying Amount	141,200		141,200		134,700
Accumulated Amortization	45,800		45,800		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		41,800
Accumulated Amortization	16,900		16,900		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		6,000
Accumulated Amortization	5,000		5,000		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		9,400
Accumulated Amortization	$ 8,200		$ 8,200		$ 9,200
Weighted average useful lives of amortizable intangible assets (in years)			15