Goodwill and Other Intangible Assets (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of the Company's amortizable intangible assets
Gross Carrying Amount	$ 226,400	$ 191,900
Accumulated Amortization	85,800	67,900
Weighted average useful lives of amortizable intangible assets	10 years
Amortization expense	19,800	15,200	14,000
Amortization expense estimated for each of the next five fiscal years
2013	19,400
2014	17,500
2015	17,000
2016	16,200
2017	16,000
Customer relationships
Summary of the Company's amortizable intangible assets
Gross Carrying Amount	166,800	134,700
Accumulated Amortization	54,000	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	44,200	41,800
Accumulated Amortization	18,800	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
Accumulated Amortization	5,300	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
Accumulated Amortization	$ 7,700	$ 9,200
Weighted average useful lives of amortizable intangible assets	15 years