Contingencies (Details) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012 USD ($)	Apr. 02, 2011 USD ($)	Mar. 31, 2012 Huntsville Site [Member] USD ($)	Apr. 02, 2011 Pending or Threatened Litigation [Member] USD ($)	Mar. 31, 2012 Tekelec Matter [Member] EUR (€)	Mar. 31, 2012 E ON AG [Member] USD ($)	Mar. 31, 2012 Groundwater Removal [Member] Norco Site [Member] USD ($)	Mar. 31, 2012 Project Management [Member] Norco Site [Member] USD ($)	Mar. 31, 2012 Investigation Report [Member] Huntsville Site [Member] USD ($)	Mar. 31, 2012 Investigation Report [Member] Norco Site [Member] USD ($)
Site Contingency [Line Items]
Settlement of legal matter	$ 0	$ 5,875		$ 5,875
Settlement of legal matter	0	3,609		3,609
Loss Related to Litigation Settlement Per Share				$ 0.03
Loss Contingency, Range of Possible Loss, Maximum					11,333
Loss Contingency Damages Sought Value					3,742	16,000
Loss Contingency, Expenses Sought, Value					312
Environmental Remediation Expense To Date			4,000				11,000	31,000
Additional Expected Project Expenditures Low Estimate			3,000				12,500	200	500	250
Additional Expected Project Expenditures High Estimate			4,000				24,250	300	750	500
Future Costs Expected to Be Covered by Indeminifcations	450
Loss Contingency, Related Receivable Carrying Value	49,537
Loss Contingency, Related Receivable Carrying Value, Period Increase (Decrease)	583
Environmental Cost Recognized, Recovery Credited to Expense	13,000
Claim For Reimbursement of Pre Acquisition Tax Liabilities						8,729
Pre Acquisition Tax Liabilities Acknowledged by Acquiree						6,335
Business Combination, Tax Receivable Assumed, Expected to be Recovered						$ 4,495