Intangible Assets (Intangible Assets Other Than Goodwill) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Accumulated Amortization	$ (156,393)	$ (134,350)
Intangible assets, Gross	$ 271,404	255,851
Weighted average useful life remaining (in years)	4 years
Customer Relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	$ 106,238	99,067
Intangible assets with finite lives: Accumulated Amortization	(53,546)	(46,252)
Intangible assets with finite lives: Net	$ 52,692	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	$ 55,492	52,881
Intangible assets with finite lives: Accumulated Amortization	(34,822)	(27,543)
Intangible assets with finite lives: Net	$ 20,670	25,338
Weighted average useful life remaining (in years)	4 years
Trade Names [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	$ 30,409	28,110
Intangible assets with finite lives: Accumulated Amortization	(18,099)	(16,015)
Intangible assets with finite lives: Net	$ 12,310	12,095
Weighted average useful life remaining (in years)	5 years
Patent Costs [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	$ 17,072	16,263
Intangible assets with finite lives: Accumulated Amortization	(6,613)	(5,873)
Intangible assets with finite lives: Net	$ 10,459	10,390
Weighted average useful life remaining (in years)	9 years
Trade Secrets [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	$ 19,569	19,134
Intangible assets with finite lives: Accumulated Amortization	(10,537)	(9,383)
Intangible assets with finite lives: Net	$ 9,032	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	$ 17,038	16,965
Intangible assets with finite lives: Accumulated Amortization	(11,526)	(10,674)
Intangible assets with finite lives: Net	$ 5,512	6,291
Weighted average useful life remaining (in years)	4 years
Other [Member]
Finite-Lived Intangible Assets [Line Items]
Intangible assets with finite lives: Gross	$ 25,586	23,431
Intangible assets with finite lives: Accumulated Amortization	(21,250)	(18,610)
Intangible assets with finite lives: Net	$ 4,336	$ 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