Fair Value Disclosures (Details) (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2012 Significant Unobservable Inputs (Level 3) [Member]	Jun. 30, 2012 Fair Value, Measurements, Recurring [Member]	Jun. 30, 2012 Fair Value, Measurements, Recurring [Member] Foreign Currency Forward (Euro) [Member]	Jun. 30, 2012 Fair Value, Measurements, Recurring [Member] Interest Rate Swap Agreements [Member]	Jun. 30, 2012 Fair Value, Measurements, Recurring [Member] Contingent Consideration [Member]	Jun. 30, 2012 Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]	Jun. 30, 2012 Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] Foreign Currency Forward (Euro) [Member]	Jun. 30, 2012 Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] Interest Rate Swap Agreements [Member]	Jun. 30, 2012 Fair Value, Measurements, Recurring [Member] Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] Contingent Consideration [Member]	Jun. 30, 2012 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member]	Jun. 30, 2012 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Foreign Currency Forward (Euro) [Member]	Jun. 30, 2012 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Interest Rate Swap Agreements [Member]	Jun. 30, 2012 Fair Value, Measurements, Recurring [Member] Significant Other Observable Inputs (Level 2) [Member] Contingent Consideration [Member]	Jun. 30, 2012 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member]	Jun. 30, 2012 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Foreign Currency Forward (Euro) [Member]	Jun. 30, 2012 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Interest Rate Swap Agreements [Member]	Jun. 30, 2012 Fair Value, Measurements, Recurring [Member] Significant Unobservable Inputs (Level 3) [Member] Contingent Consideration [Member]	Jun. 30, 2012 Rahu Catalytics Limited [Member]	Dec. 22, 2011 Rahu Catalytics Limited [Member]
Fair Value, Liabilities Measured on Recurring Basis, Financial Statement Captions [Line Items]
Fair value measurements, total liabilities			$ 15,571,000	$ 3,563,000	$ 221,000	$ 11,787,000	$ 0	$ 0	$ 0	$ 0	$ 3,784,000	$ 3,563,000	$ 221,000	$ 0	$ 11,787,000	$ 0	$ 0	$ 11,787,000
Transfer into or out of fair value measurement	0
Contigent considertion amounts based on certain volume targets																			25,200,000	20,000,000
Fair Value Measurements with Unobservable Inputs Reconciliations Recuring Basis Change In Estimate Of Contingent Consideration Liability Value		(2,737,000)
Long-term Debt	662,300,000
Long-term Debt, Fair Value	$ 658,600,000