Intangible Assets (Intangible Assets Other Than Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	$ 260,047	$ 255,851
Intangible assets with finite lives: Accumulated Amortization	(161,264)	(134,350)
Intangible assets with finite lives: Net	$ 98,783	121,501
Weighted average useful life remaining (in years)	6 years
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	$ 105,505	99,067
Intangible assets with finite lives: Accumulated Amortization	(57,796)	(46,252)
Intangible assets with finite lives: Net	$ 47,709	52,815
Weighted average useful life remaining (in years)	6 years
Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	$ 54,716	52,881
Intangible assets with finite lives: Accumulated Amortization	(39,644)	(27,543)
Intangible assets with finite lives: Net	$ 15,072	25,338
Weighted average useful life remaining (in years)	2 years
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	$ 25,813	28,110
Intangible assets with finite lives: Accumulated Amortization	(15,552)	(16,015)
Intangible assets with finite lives: Net	$ 10,261	12,095
Weighted average useful life remaining (in years)	6 years
Patent Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	$ 17,909	16,263
Intangible assets with finite lives: Accumulated Amortization	(7,338)	(5,873)
Intangible assets with finite lives: Net	$ 10,571	10,390
Weighted average useful life remaining (in years)	15 years
Trade Secrets [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	$ 19,431	19,134
Intangible assets with finite lives: Accumulated Amortization	(11,530)	(9,383)
Intangible assets with finite lives: Net	$ 7,901	9,751
Intangible assets estimated useful lives	7 years
Weighted average useful life remaining (in years)	4 years
Acquired Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	$ 16,661	16,965
Intangible assets with finite lives: Accumulated Amortization	(11,969)	(10,674)
Intangible assets with finite lives: Net	$ 4,692	6,291
Weighted average useful life remaining (in years)	8 years
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	$ 20,012	23,431
Intangible assets with finite lives: Accumulated Amortization	(17,435)	(18,610)
Intangible assets with finite lives: Net	$ 2,577	$ 4,821
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] | Customer Relationships [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] | Trade Names [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 Patents [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] | Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	14 years
Maximum [Member] | Acquired Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	16 years
Maximum [Member] | Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	8 years
Maximum [Member] | Patent Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	20 years
Maximum [Member] | Acquired Patents [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	6 years
Maximum [Member] | Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets estimated useful lives	4 years