Business Acquisitions and Investments - Acquired Intangibles (Details) (USD $) In Thousands, unless otherwise specified	0 Months Ended
May 01, 2014 Stanadyne [Member]	May 01, 2014 Stanadyne [Member] Customer relationships [Member]	May 01, 2014 Stanadyne [Member] Developed technology [Member]	Dec. 16, 2013 Air Filtrations Segment of General Electric [Member]	Dec. 16, 2013 Air Filtrations Segment of General Electric [Member] Trade names [Member]	Dec. 16, 2013 Air Filtrations Segment of General Electric [Member] Customer relationships [Member]	Dec. 16, 2013 Air Filtrations Segment of General Electric [Member] Developed technology [Member]	Dec. 16, 2013 Air Filtrations Segment of General Electric [Member] Trademarks [Member]	Dec. 16, 2013 Air Filtrations Segment of General Electric [Member] Backlog [Member]	May 01, 2014 Trademarks [Member] Stanadyne [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Estimated value	$ 146,430	$ 135,250	$ 11,000	$ 133,020	$ 35,100	$ 77,300	$ 19,900	$ 50	$ 670
Estimated value										$ 180
Weighted average Useful life		13 years	10 years			13 years	13 years
Amortization method		Straight-line	Straight-line		Not amortized	Straight-line	Straight-line	Accelerated	Accelerated

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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

+ Details

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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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- Definition

The amortization method of a major finite-lived intangible asset class. 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. The straight-line method is the preferred amortization method, unless another method better reflects the pattern in which the asset is consumed.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 350

-SubTopic 30

-Section 35

-Paragraph 6

-URI http://asc.fasb.org/extlink&oid=26713198&loc=d3e15372-109273

+ Details

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- Definition

Amount of increase in assets, excluding financial assets and goodwill, lacking physical substance with an indefinite life, resulting from a business combination.

+ References

No definition available.

+ Details

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