Goodwill and Other Intangible Assets (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 202,824	$ 206,429
Accumulated Amortization	149,766	147,905
Intangible assets, net	53,043	58,524
Finite-lived Intangible Assets Acquired	4,078
Amortization expense for intangible assets	8,800	9,900	$ 13,800
Estimated amortization expense for the next five years
2016	8,000
2017	5,500
2018	5,250
2019	4,750
2020	4,500
Customer related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	153,287	157,530
Accumulated Amortization	111,227	112,211
Finite-lived Intangible Assets Acquired	3,398
Acquired Finite-lived Intangible Asset, Residual Value	$ 0
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	19 years
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,092	1,107
Accumulated Amortization	1,092	1,039
Patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	5,882	6,079
Accumulated Amortization	5,495	5,399
Technology related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	25,559	26,548
Accumulated Amortization	23,089	21,233
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	8,303	7,745
Accumulated Amortization	4,194	3,733
Finite-lived Intangible Assets Acquired	580
Acquired Finite-lived Intangible Asset, Residual Value	$ 0
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	20 years
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 8,701	7,420
Accumulated Amortization	4,669	$ 4,290
Finite-lived Intangible Assets Acquired	100
Acquired Finite-lived Intangible Asset, Residual Value	$ 0
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	1 year