Goodwill and Other Intangible Assets (Details 2) (USD $)	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 206,429,000	$ 196,695,000
Accumulated Amortization	147,905,000	143,434,000
Intangible assets, net	58,524,000us-gaap_FiniteLivedIntangibleAssetsNet	53,261,000us-gaap_FiniteLivedIntangibleAssetsNet
Finite-lived Intangible Assets Acquired	17,575,000
Amortization expense for intangible assets	9,900,000us-gaap_AmortizationOfIntangibleAssets	13,800,000us-gaap_AmortizationOfIntangibleAssets	17,600,000us-gaap_AmortizationOfIntangibleAssets
Estimated amortization expense for the next five years
2015	8,350,000
2016	7,800,000
2017	5,050,000
2018	4,850,000
2019	4,800,000
Customer related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	157,530,000	150,307,000
Accumulated Amortization	112,211,000	110,889,000
Finite-lived Intangible Assets Acquired	13,928,000
Acquired Finite-lived Intangible Asset, Residual Value	0
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	12 years
Non-compete agreements
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	1,107,000	1,126,000
Accumulated Amortization	1,039,000	1,024,000
Patents
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	6,079,000	6,211,000
Accumulated Amortization	5,399,000	5,273,000
Technology related
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	26,548,000	27,185,000
Accumulated Amortization	21,233,000	18,931,000
Trade names
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7,745,000	4,113,000
Accumulated Amortization	3,733,000	2,969,000
Finite-lived Intangible Assets Acquired	3,647,000
Acquired Finite-lived Intangible Asset, Residual Value	0
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life	15 years
Other
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	7,420,000	7,753,000
Accumulated Amortization	$ 4,290,000	$ 4,348,000

The aggregate expected value at the end of their useful life of a major finite-lived intangible asset class acquired during the period either individually or as part of a group of assets (in either an asset acquisition or business combination). A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275

+ Details

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Balance Type:	debit
Period Type:	instant

- Definition

Weighted average amortization period of finite-lived intangible assets acquired either individually or as part of a group of assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 1

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(2)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 50

-Paragraph 2

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16323-109275

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- Definition

Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, resulting from a business combination.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
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Period Type:	duration

- Definition

Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.

+ References