Goodwill and Other Intangible Assets (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 195,074	$ 201,732
Accumulated Amortization	153,507	148,674
Intangible assets, net	41,567	53,043
Amortization expense for intangible assets	7,900	8,800	$ 9,900
Finite-Lived Intangible Assets Including Current, Net		53,100
Estimated amortization expense for the next five years
2017	5,000
2018	4,750
2019	4,500
2020	4,250
2021	4,000
Customer related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	146,840	153,287
Accumulated Amortization	112,610	111,227
Patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,729	5,882
Accumulated Amortization	5,534	5,495
Technology related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	25,687	25,559
Accumulated Amortization	25,634	23,089
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8,306	8,303
Accumulated Amortization	4,529	4,194
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8,512	8,701
Accumulated Amortization	$ 5,200	$ 4,669