Goodwill And Other Intangibles (Summary Of Intangible Assets) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
Gross Carrying Amount	$ 274,100	$ 244,569
Accumulated Amortization	96,336	76,082
Net Carrying Amount	177,764	168,487
Contract and program intangibles [Member]
Gross Carrying Amount	243,082	219,382
Accumulated Amortization	75,351	57,754
Net Carrying Amount	167,731	161,628
Capitalized software cost for sale [Member]
Gross Carrying Amount	3,729	3,729
Accumulated Amortization	3,729	3,729
Net Carrying Amount	0	0
Capitalized software cost for internal use [Member]
Gross Carrying Amount	27,231	21,400
Accumulated Amortization	17,230	14,578
Net Carrying Amount	10,001	6,822
Other [Member]
Gross Carrying Amount	58	58
Accumulated Amortization	26	21
Net Carrying Amount	$ 32	$ 37