Revenue Earned In Excess Of Billings And Deferred Revenue (Summary Of Revenue Earned In Excess Of Billings And Deferred Revenue) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Revenue In Excess Of Billings [Line Items]
Revenue earned in excess of billings	$ 5,131	$ 5,329
Time-And-Materials Projects [Member]
Revenue In Excess Of Billings [Line Items]
Revenue earned in excess of billings	8,640	10,975
Fixed-Price Projects [Member]
Revenue In Excess Of Billings [Line Items]
Revenue earned in excess of billings	$ (3,509)	$ (5,646)