Goodwill and Other Intangible Assets (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 189,813	$ 202,162
Accumulated Amortization	109,988	163,911
Intangible assets, net	79,825	38,251
Amortization expense for intangible assets	7,700	5,100	$ 7,900
Estimated amortization expense for the next five years
2019	9,000
2020	8,750
2021	8,500
2022	8,250
2023	8,250
Customer related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	136,307	153,014
Accumulated Amortization	99,383	121,385
Patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	2,598	5,825
Accumulated Amortization	2,503	5,700
Technology related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	35,831	26,131
Accumulated Amortization	2,681	26,131
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	9,212	8,317
Accumulated Amortization	1,897	4,845
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,865	8,875
Accumulated Amortization	$ 3,524	$ 5,850