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
Consolidated Statements of Operations [Abstract]
Revenue	$ 177,061	$ 175,884	$ 570,062	$ 565,339
Operating expenses	153,961	157,243	483,320	486,952
Gross margin	23,100	18,641	86,742	78,387
Corporate general and administrative expenses	8,175	6,877	24,686	22,499
Operating income	14,925	11,764	62,056	55,888
Other income (expense):
Interest expense	(4,049)	(3,735)	(13,371)	(10,314)
Gain on sale of operations, net	87	89	2,832	465
Other (expense) income, net	(4,510)	1,015	(1,402)	1,141
Total other expense, net	(8,472)	(2,631)	(11,941)	(8,708)
Income from continuing operations before income tax expense	6,453	9,133	50,115	47,180
Income tax expense	1,614	3,591	20,296	17,773
Income from continuing operations after income tax expense	4,839	5,542	29,819	29,407
Loss from discontinued operations, net of tax	(46)	(747)	(640)	(2,174)
(Loss) gain on disposal of discontinued operations, net of tax	(76)	37	(6)	(995)
Net income	$ 4,717	$ 4,832	$ 29,173	$ 26,238
Basic:
Continuing operations	$ 0.10	$ 0.09	$ 0.60	$ 0.48
Discontinued operations		$ (0.01)	$ (0.01)	$ (0.05)
Net income	$ 0.10	$ 0.08	$ 0.59	$ 0.43
Diluted:
Continuing operations	$ 0.10	$ 0.09	$ 0.60	$ 0.48
Discontinued operations		$ (0.01)	$ (0.02)	$ (0.05)
Net income	$ 0.10	$ 0.08	$ 0.58	$ 0.43
Basic weighted average shares outstanding	49,525	59,108	49,488	60,680
Diluted weighted average shares outstanding	49,920	59,579	49,932	61,212