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