Intangible Assets (Intangible Assets Other Than Goodwill) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Accumulated Amortization	$ (144,806)	$ (134,350)
Intangible assets, Gross	$ 267,400	255,851
Weighted average useful life remaining (in years)	4 years
Patent Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	$ 16,969	16,263
Intangible assets with finite lives: Accumulated Amortization	(6,337)	(5,873)
Intangible assets with finite lives: Net	$ 10,632	10,390
Weighted average useful life remaining (in years)	9 years
Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	$ 54,192	52,881
Intangible assets with finite lives: Accumulated Amortization	(31,125)	(27,543)
Intangible assets with finite lives: Net	$ 23,067	25,338
Weighted average useful life remaining (in years)	4 years
Acquired Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	$ 16,982	17,047
Intangible assets with finite lives: Accumulated Amortization	(11,093)	(9,454)
Intangible assets with finite lives: Net	$ 5,889	7,593
Weighted average useful life remaining (in years)	4 years
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	$ 103,106	99,067
Intangible assets with finite lives: Accumulated Amortization	(49,576)	(46,252)
Intangible assets with finite lives: Net	$ 53,530	52,815
Weighted average useful life remaining (in years)	6 years
Trade Secrets [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	$ 19,254	19,530
Intangible assets with finite lives: Accumulated Amortization	(9,926)	(7,919)
Intangible assets with finite lives: Net	$ 9,328	11,611
Weighted average useful life remaining (in years)	4 years
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	$ 32,926	28,110
Intangible assets with finite lives: Accumulated Amortization	(16,936)	(16,015)
Intangible assets with finite lives: Net	$ 15,990	12,095
Weighted average useful life remaining (in years)	5 years
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	$ 23,971	22,953
Intangible assets with finite lives: Accumulated Amortization	(19,813)	(21,294)
Intangible assets with finite lives: Net	$ 4,158	$ 1,659
Weighted average useful life remaining (in years)	2 years
Minimum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	1 year
Minimum [Member] | Patent Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	1 year
Minimum [Member] | Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	1 year
Minimum [Member] | Acquired Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	1 year
Minimum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	1 year
Minimum [Member] | Trade Secrets [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	7 years
Minimum [Member] | Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	1 year
Minimum [Member] | Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	2 years
Maximum [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	20 years
Maximum [Member] | Patent Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	20 years
Maximum [Member] | Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	16 years
Maximum [Member] | Acquired Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	6 years
Maximum [Member] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	14 years
Maximum [Member] | Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	8 years
Maximum [Member] | Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	4 years