Intangible Assets (Intangible Assets Other Than Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross	$ 254,288	$ 260,047
Accumulated Amortization	(186,013)	(161,264)
Net	$ 68,275	98,783
Weighted Average Useful Life Remaining (in years)	5 years
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross	$ 103,332	105,505
Accumulated Amortization	(67,129)	(57,796)
Net	$ 36,203	47,709
Weighted Average Useful Life Remaining (in years)	5 years
Acquired technology
Finite-Lived Intangible Assets [Line Items]
Gross	$ 52,691	54,716
Accumulated Amortization	(47,546)	(39,644)
Net	$ 5,145	15,072
Weighted Average Useful Life Remaining (in years)	2 years
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross	$ 25,096	25,813
Accumulated Amortization	(17,669)	(15,552)
Net	$ 7,427	10,261
Weighted Average Useful Life Remaining (in years)	5 years
Patent costs
Finite-Lived Intangible Assets [Line Items]
Gross	$ 11,032	17,909
Accumulated Amortization	(8,382)	(7,338)
Net	$ 2,650	10,571
Weighted Average Useful Life Remaining (in years)	14 years
Trade secrets
Finite-Lived Intangible Assets [Line Items]
Gross	$ 19,374	19,431
Accumulated Amortization	(13,574)	(11,530)
Net	$ 5,800	7,901
Weighted Average Useful Life Remaining (in years)	3 years
Acquired patents
Finite-Lived Intangible Assets [Line Items]
Gross	$ 16,212	16,661
Accumulated Amortization	(13,160)	(11,969)
Net	$ 3,052	4,692
Weighted Average Useful Life Remaining (in years)	7 years
Other
Finite-Lived Intangible Assets [Line Items]
Gross	$ 26,551	20,012
Accumulated Amortization	(18,553)	(17,435)
Net	$ 7,998	$ 2,577
Weighted Average Useful Life Remaining (in years)	1 year
Minimum
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	1 year
Minimum | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	1 year
Minimum | Acquired technology
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	1 year
Minimum | Trade names
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	3 years
Minimum | Patent costs
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	1 year
Minimum | Trade secrets
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	2 years
Minimum | Acquired patents
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	6 years
Minimum | Other
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	1 year
Maximum
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	19 years
Maximum | Customer relationships
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	12 years
Maximum | Acquired technology
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	2 years
Maximum | Trade names
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	6 years
Maximum | Patent costs
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	19 years
Maximum | Trade secrets
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	4 years
Maximum | Acquired patents
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	8 years
Maximum | Other
Finite-Lived Intangible Assets [Line Items]
Useful Life (in years)	2 years