SUPPLEMENTAL BALANCE SHEET INFORMATION (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011
Contract Receivables, Net [Abstract]
Billed receivables	$ 17,756	$ 25,821
Revenues recorded in excess of milestone billings on fixed price contracts with state and local government agencies	5,759	7,058
Retainage and fee withholdings, long term	616	518
Other unbilled receivables	28,328	33,935
Total unbilled receivables	34,703	41,511
Allowance for doubtful accounts	(1,041)	(866)
Contract receivables, net	51,418	66,466
Prepaid Expense and Other Current Assets [Abstract]
Income Taxes Receivable	1,283	0
Restricted cash	255	240
Other	2,092	2,326
Prepaid expenses and other assets	3,630	2,566
Property and Equipment [Line Items]
Property and equipment	33,083	32,380
Less accumulated depreciation	(19,878)	(17,115)
Property and equipment, net	13,205	15,265
Other Noncurrent Assets [Abstract]
Deferred compensation plan investments	1,458	1,395
Equity investments	802	1,038
Other	2,049	1,879
Other noncurrent assets	4,309	4,312
Accrued compensation and employee benefits [Abstract]
Accrued vacation	6,026	6,036
Accrued compensation and related taxes	5,270	11,601
Accrued pension liability	5,909	5,480
Other employee related benefits	2,368	1,785
Accrued compensation and employee benefits	19,573	24,902
Other Accrued Expenses [Abstract]
Accrued interest	165	1,525
Deferred rent liability	1,157	554
Deferred gain on sale of building	676	676
Net working capital payment accrual	0	2,388
Other	3,613	3,413
Other accrued expenses	5,611	8,556
Other long-term liabilities
Accrued pension liability	17,377	21,576
Deferred rent liability	5,806	6,610
Deferred gain on sale of building	1,521	2,028
Deferred compensation plan liabilities	1,458	1,395
Other	721	1,457
Other long-term liabilities	26,883	33,066
Software [Member]
Property and Equipment [Line Items]
Property and equipment	11,655	11,334
Leasehold Improvements [Member]
Property and Equipment [Line Items]
Property and equipment	11,148	10,861
Furniture and Other Equipment [Member]
Property and Equipment [Line Items]
Property and equipment	$ 10,280	$ 10,185