Goodwill and Other Intangible Assets (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Goodwill and Other Intangible Assets
Indefinite-lived trade name intangible asset	$ 4,300
Summary of the Company's amortizable intangible assets
Gross Carrying Amount	272,000	226,400
Accumulated Amortization	107,100	85,800
Weighted average useful lives of amortizable intangible assets	10 years
Amortization expense	20,100	19,800	15,200
Amortization expense estimated for each of the next five fiscal years
2014	26,700
2015	24,200
2016	23,400
2017	23,200
2018	19,000
Customer relationships
Summary of the Company's amortizable intangible assets
Gross Carrying Amount	202,300	166,800
Accumulated Amortization	69,800	54,000
Weighted average useful lives of amortizable intangible assets	9 years
Proprietary technology
Summary of the Company's amortizable intangible assets
Gross Carrying Amount	52,300	44,200
Accumulated Amortization	22,400	18,800
Weighted average useful lives of amortizable intangible assets	14 years
License agreements
Summary of the Company's amortizable intangible assets
Gross Carrying Amount	6,000	6,000
Accumulated Amortization	6,000	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	11,400	9,400
Accumulated Amortization	$ 8,900	$ 7,700
Weighted average useful lives of amortizable intangible assets	15 years