Commitments And Contingencies (Details)	0 Months Ended	9 Months Ended		9 Months Ended				9 Months Ended							3 Months Ended
	Oct. 27, 2011 USD ($)	Sep. 30, 2011 USD ($)	Sep. 30, 2011 SGD	Sep. 30, 2011 Letters Of Credit [Member] Expiration Start Date [Member]	Sep. 30, 2011 Letters Of Credit [Member] Expiration End Date [Member]	Sep. 30, 2011 Euros To US Dollars [Member] USD ($)	Sep. 30, 2011 Singapore Dollars Converted US Dollars [Member] USD ($)	Sep. 30, 2011 Bonds [Member] USD ($)	Mar. 31, 2011 Understated Income [Member] Indian Authority [Member] USD ($)	Mar. 31, 2011 Improper Rate [Member] Indian Authority [Member] USD ($)	Sep. 30, 2011 Third Party Service Providers [Member] Nigerian Authority [Member] USD ($)	Sep. 30, 2011 Singapore, Dollars [Member] SGD	Sep. 30, 2011 Euro Member Countries, Euro [Member] EUR (€)	Sep. 30, 2011 Mexican Revenue Department [Member] USD ($)	Sep. 30, 2009 Mexican Authority [Member]	Sep. 30, 2011 Algerian Authority [Member] USD ($)	Sep. 30, 2011 Nigerian Authority [Member] USD ($)
Commitments and Contingencies [Line Items]
Estimated cost to complete capital expenditure projects in progress		$ 77,300,000
Long-term purchase commitment, amount		47,400,000				1,700,000	14,300,000					18,600,000	1,200,000
Notional amount of foreign currency derivative purchase contracts			7,500,000
Aggregate amount of outstanding bonds								32,400,000
Aggregate amount of outstanding letters of credit		14,900,000
Debt instrument, maturity date range, start								October 2011
Debt instrument, maturity date range, end								July 2012
Line of credit facility, expiration date		October 18, 2012		October 2011	March 2013
Contingent liability foreign tax assessments									4,500,000	4,400,000	36,100,000			5,900,000		10,400,000	17,600,000
Tax rate on equipment leases															10.00%
Fees and expenses to plaintiffs	$ 837,500