Commitments and Contingencies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			66 Months Ended	3 Months Ended	12 Months Ended	3 Months Ended
	Mar. 31, 2012 facility	Mar. 31, 2011	Nov. 04, 2011 Italy facility	Mar. 31, 2012 Government Contract Billing Matter	Mar. 31, 2012 State of Massachusetts Notices of Intention to Assess	Dec. 31, 2011 Italy Fire Italy facility	Mar. 31, 2012 Litigation
Commitments and Contingencies
Loss contingencies, reasonably possible loss exposure in excess of the amount currently accrued							$ 52,000
Total revenue billed and recorded since renewal of contract in October 2006	746,498	746,009		45,000
Notices of intention to assess, including tax and penalties (but excluding interest), related to assessment of income tax or net worth tax					$ 7,867
Number of global facilities	1,000
Number of leased facilities			10
Number of facilities damaged						1