Goodwill and Other Intangible Assets (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Summary of the Company's amortizable intangible assets
Gross Carrying Amount	$ 232,100		$ 232,100		$ 226,400
Accumulated Amortization	95,900		95,900		85,800
Weighted average useful lives of amortizable intangible assets			10 years
Amortization expense	4,900	4,700	10,000	9,200
Amortization expense estimated for each of the next five fiscal years
2013	19,800		19,800
2014	18,300		18,300
2015	17,800		17,800
2016	17,000		17,000
2017	16,800		16,800
Customer relationships
Summary of the Company's amortizable intangible assets
Gross Carrying Amount	172,500		172,500		166,800
Accumulated Amortization	61,700		61,700		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		44,200
Accumulated Amortization	20,600		20,600		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		6,000
Accumulated Amortization	5,700		5,700		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		9,400
Accumulated Amortization	$ 7,900		$ 7,900		$ 7,700
Weighted average useful lives of amortizable intangible assets			15 years