Contingencies (Details) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended	12 Months Ended
	Apr. 02, 2011 USD ($)	Dec. 31, 2011 USD ($)	Dec. 31, 2010 USD ($)	Dec. 31, 2009 USD ($)	Dec. 31, 2011 Huntsville Site [Member] USD ($)	Dec. 31, 2011 Norco Site [Member] USD ($)	Dec. 31, 2011 Pending or Threatened Litigation [Member] USD ($)	Dec. 31, 2011 Tekelec Matter [Member] EUR (€)	Dec. 31, 2011 E ON AG [Member] USD ($)	Dec. 31, 2011 Groundwater Removal [Member] Huntsville Site [Member] USD ($)	Dec. 31, 2011 Groundwater Removal [Member] Norco Site [Member] USD ($)	Dec. 31, 2011 Project Management [Member] Norco Site [Member] USD ($)	Dec. 31, 2011 Investigation Report [Member] Norco Site [Member] USD ($)
Site Contingency [Line Items]
Settlement of legal matter		$ 5,875	$ 0	$ 0			$ 5,875
Settlement of legal matter	(3,609)	3,609	0	0			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						16,000		3,742
Loss Contingency, Expenses Sought, Value								312
Site Contingency, Loss Exposure Not Accrued, Low Estimate					3,000
Site Contingency, Loss Exposure Not Accrued, High Estimate					4,000
Environmental Remediation Expense To Date										4,000	11,000	30,000
Additional Expected Project Expenditures Low Estimate										500	12,500	200	250
Additional Expected Project Expenditures High Estimate										750	24,250	300	500
Future Costs Expected to Be Covered by Indeminifcations		450
Loss Contingency, Related Receivable Carrying Value		48,954
Loss Contingency, Related Receivable Carrying Value, Period Increase (Decrease)		4,751
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