Goodwill and Other Intangible Assets (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Summary of the Company's amortizable intangible assets
Gross Carrying Amount	$ 231,000		$ 231,000		$ 226,400
Accumulated Amortization	100,900		100,900		85,800
Weighted average useful lives of amortizable intangible assets			10 years
Amortization expense	5,000	4,700	15,000	13,900
Amortization expense estimated for each of the next five fiscal years
2013	19,900		19,900
2014	18,200		18,200
2015	17,700		17,700
2016	16,800		16,800
2017	16,600		16,600
Customer relationships
Summary of the Company's amortizable intangible assets
Gross Carrying Amount	171,400		171,400		166,800
Accumulated Amortization	65,600		65,600		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	21,500		21,500		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	5,900		5,900		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