SHARE-BASED COMPENSATION (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Share-based compensation expense
Share-based compensation expense	$ 1,549,000	$ 1,680,000	$ 3,403,000	$ 3,517,000
Income tax benefit	(679,000)	(727,000)	(1,487,000)	(1,523,000)
Total share-based compensation expense, net of tax	870,000	953,000	1,916,000	1,994,000
Direct cost of services
Share-based compensation expense
Share-based compensation expense	33,000	29,000	121,000	126,000
General and administrative
Share-based compensation expense
Share-based compensation expense	$ 1,516,000	$ 1,651,000	$ 3,282,000	$ 3,391,000