Condensed Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Condensed Consolidated Statements of Operations [Abstract]
Revenues	$ 302,544	$ 294,455	$ 922,614	$ 849,572
Operating expenses:
Direct salaries and related costs	197,482	190,813	609,471	551,156
General and administrative	83,520	86,821	263,817	276,861
Net (gain) loss on disposal of property and equipment	(7)	(21)	(3,450)	16
Impairment of goodwill and intangibles		362		362
Impairment of long-lived assets	38	3,103	764	3,103
Total operating expenses	281,033	281,078	870,602	831,498
Income from continuing operations	21,511	13,377	52,012	18,074
Other income (expense):
Interest income	366	312	968	812
Interest (expense)	(438)	(1,373)	(1,302)	(5,239)
Other (expense)	(356)	(527)	(2,189)	(5,546)
Total other income (expense)	(428)	(1,588)	(2,523)	(9,973)
Income from continuing operations before income taxes	21,083	11,789	49,489	8,101
Income taxes	2,969	(2,267)	6,225	(1,768)
Income from continuing operations, net of taxes	18,114	14,056	43,264	9,869
(Loss) from discontinued operations, net of taxes		(410)		(3,190)
Net income	$ 18,114	$ 13,646	$ 43,264	$ 6,679
Basic:
Continuing operations	$ 0.40	$ 0.30	$ 0.94	$ 0.22
Discontinued operations		$ (0.01)		$ (0.07)
Net income per common share	$ 0.40	$ 0.29	$ 0.94	$ 0.15
Diluted:
Continuing operations	$ 0.40	$ 0.30	$ 0.94	$ 0.21
Discontinued operations		$ (0.01)		$ (0.06)
Net income per common share	$ 0.40	$ 0.29	$ 0.94	$ 0.15
Weighted average common shares:
Basic	45,557	46,468	46,106	45,889
Diluted	45,653	46,559	46,202	45,989