Fair Value Disclosures (Details)	3 Months Ended
	Mar. 31, 2012 USD ($)	Mar. 31, 2012 Significant Unobservable Inputs (Level 3) [Member] USD ($)	Dec. 31, 2011 Significant Unobservable Inputs (Level 3) [Member] USD ($)	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] USD ($)	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Foreign Currency Forward (Euro) [Member] USD ($)	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Interest Rate Swap Agreements [Member] USD ($)	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Contingent Consideration [Member] USD ($)	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] USD ($)	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] Foreign Currency Forward (Euro) [Member] USD ($)	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] Interest Rate Swap Agreements [Member] USD ($)	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] Contingent Consideration [Member] USD ($)	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] USD ($)	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Foreign Currency Forward (Euro) [Member] USD ($)	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Interest Rate Swap Agreements [Member] USD ($)	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Contingent Consideration [Member] USD ($)	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] USD ($)	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Foreign Currency Forward (Euro) [Member] USD ($)	Mar. 31, 2012 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Interest Rate Swap Agreements [Member] USD ($)	Mar. 31, 2012 Rahu Catalytics Limited [Member] USD ($)	Dec. 22, 2011 Rahu Catalytics Limited [Member] EUR (€)
Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Transfer into or out of fair value measurement	$ 0
Contigent considertion amounts based on certain volume targets																			26,700,000	20,000,000
Fair Value Measurements with Unobservable Inputs Reconciliations Recuring Basis Change In Estimate Of Contingent Consideration Liability Value		(2,737,000)
Fair value measurements, total liabilities				13,539,000	1,128,000	330,000	12,081,000	0	0	0	0	1,458,000	1,128,000	330,000	0	12,081,000	0	0
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value		12,081,000	14,104,000
Long-term Debt	678,300,000
Long-term Debt, Fair Value	$ 681,900,000