Goodwill and Other Intangible Assets (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Summary of the Company's amortizable intangible assets
Gross Carrying Amount	$ 225,600		$ 226,400
Accumulated Amortization	90,800		85,800
Weighted average useful lives of amortizable intangible assets	10 years
Amortization expense	5,000	4,500
Amortization expense estimated for each of the next five fiscal years
2013	19,300
2014	17,400
2015	16,900
2016	16,100
2017	15,900
Customer relationships
Summary of the Company's amortizable intangible assets
Gross Carrying Amount	166,000		166,800
Accumulated Amortization	57,800		54,000
Weighted average useful lives of amortizable intangible assets	10 years
Proprietary technology
Summary of the Company's amortizable intangible assets
Gross Carrying Amount	44,200		44,200
Accumulated Amortization	19,700		18,800
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
Accumulated Amortization	5,500		5,300
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
Accumulated Amortization	$ 7,800		$ 7,700
Weighted average useful lives of amortizable intangible assets	15 years