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Operating Segments and Related Information Operating Segments and Related Information (Details 6) (US Government, USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
US Government
   
Revenue, Major Customer [Line Items]    
Revenues $ 98,504 $ 118,520 [1]
[1] Amounts have been adjusted for the reclassification of certain discontinued operations to continuing operations.