Acquired Intangible Assets (Details) (USD $)	3 Months Ended			9 Months Ended															6 Months Ended
	Sep. 30, 2014		Sep. 30, 2013	Sep. 30, 2014		Sep. 30, 2013	Dec. 31, 2013		Sep. 30, 2014 Customer Relationships [Member]	Dec. 31, 2013 Customer Relationships [Member]	Sep. 30, 2014 Trademarks and Trade Names [Member]	Dec. 31, 2013 Trademarks and Trade Names [Member]	Sep. 30, 2014 Non-compete Agreements [Member]	Dec. 31, 2013 Non-compete Agreements [Member]	Sep. 30, 2014 Patents and Supply Contracts [Member]	Dec. 31, 2013 Patents and Supply Contracts [Member]	Sep. 30, 2014 Leaseholds [Member]	Dec. 31, 2013 Leaseholds [Member]	Sep. 30, 2014 Annex Manufacturing [Member] Customer Relationships [Member]	Sep. 30, 2014 Annex Manufacturing [Member] Non-compete Agreements [Member]
Acquired Indefinite-lived Intangible Assets [Line Items]
Total acquired intangible assets	$ 57,474,000			$ 57,474,000			$ 52,772,000		$ 48,821,000	$ 44,179,000	$ 6,800,000	$ 6,800,000	$ 970,000	$ 910,000	$ 723,000	$ 723,000	$ 160,000	$ 160,000
Less accumulated amortization	(22,879,000)	[1]		(22,879,000)	[1]		(19,202,000)	[1]
Net acquired intangible assets	34,595,000			34,595,000			33,570,000
Intangible assets acquired [Abstract]
Amount of acquired indefinite-lived intangible assets											5,200,000
Intangible assets acquired in business acquisition																			4,700,000	100,000
Estimated useful life of intangible assets																			7 years	5 years
Amortization of acquired intangible assets [Abstract]
Amortization expense	1,300,000		1,100,000	3,700,000		3,900,000
Estimated amortization expense, remainder of current year	1,300,000			1,300,000
Estimated amortization expense in year 2015	5,000,000			5,000,000
Estimated amortization expense in year 2016	4,900,000			4,900,000
Estimated amortization expense in year 2017	4,700,000			4,700,000
Estimated amortization expense in years 2018 through 2028	$ 13,500,000			$ 13,500,000

[1] Applies to all intangible assets, except for trademarks and trade names totaling $5.2 million, which have indefinite useful lives and, as such, are not being amortized.