Intangible Assets (Intangible Assets Other Than Goodwill) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, Gross	$ 183,669	$ 166,939
Intangible assets, Accumulated Amortization	(62,177)	(58,562)
Intangible assets, Net	121,492	108,377
Trademarks [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Indefinite-lived intangible assets	2,110	2,770
Licenses [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	5,875	5,875
Intangible assets with finite lives: Accumulated Amortization	(5,875)	(5,875)
Patent Costs [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	27,398	27,635
Intangible assets with finite lives: Accumulated Amortization	(14,100)	(14,047)
Intangible assets with finite lives: Net	13,298	13,588
Acquired Technology [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	26,174	26,262
Intangible assets with finite lives: Accumulated Amortization	(12,190)	(11,852)
Intangible assets with finite lives: Net	13,984	14,410
Intangible assets, useful life	5 years
Internally Developed Software [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	17,847	17,847
Intangible assets with finite lives: Accumulated Amortization	(11,783)	(11,424)
Intangible assets with finite lives: Net	6,064	6,423
Customer Relationships [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	70,618	60,329
Intangible assets with finite lives: Accumulated Amortization	(9,483)	(7,754)
Intangible assets with finite lives: Net	61,135	52,575
Non-Compete Agreements [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	14,294	14,051
Intangible assets with finite lives: Accumulated Amortization	(4,366)	(3,836)
Intangible assets with finite lives: Net	9,928	10,215
Trade Names [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	7,929	5,814
Intangible assets with finite lives: Accumulated Amortization	(1,032)	(723)
Intangible assets with finite lives: Net	6,897	5,091
Other [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	11,424	6,356
Intangible assets with finite lives: Accumulated Amortization	(3,348)	(3,051)
Intangible assets with finite lives: Net	$ 8,076	$ 3,305
Minimum [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	1 year
Minimum [Member] | Patent Costs [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	6 years
Minimum [Member] | Acquired Technology [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	5 years
Minimum [Member] | Customer Relationships [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	5 years
Minimum [Member] | Non-Compete Agreements [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	3 years
Minimum [Member] | Trade Names [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	2 years
Minimum [Member] | Other [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	1 year
Maximum [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	13 years
Maximum [Member] | Patent Costs [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	7 years
Maximum [Member] | Acquired Technology [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	10 years
Maximum [Member] | Customer Relationships [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	13 years
Maximum [Member] | Non-Compete Agreements [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	11 years
Maximum [Member] | Trade Names [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	10 years
Maximum [Member] | Other [Member]
Finite And Indefinite Lived Intangible Assets [Line Items]
Intangible assets, useful life	7 years