Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Statement of Comprehensive Income [Abstract]
Revenue	$ 185,042	$ 177,466	$ 398,908	$ 382,192
Operating expenses	163,117	158,317	333,981	320,255
Gross margin	21,925	19,149	64,927	61,937
Corporate general and administrative expenses	6,615	8,306	16,480	18,504
Operating income	15,310	10,843	48,447	43,433
Other (expense) income:
Interest expense	(2,848)	(3,577)	(5,825)	(7,010)
Gain on sale of operations, net	45	68	101	76
Other (expense) income, net	(1,126)	3,936	1,733	5,911
Total other (expense) income, net	(3,929)	427	(3,991)	(1,023)
Income from continuing operations before income tax expense	11,381	11,270	44,456	42,410
Income tax expense	4,696	4,824	18,268	17,938
Income from continuing operations	6,685	6,446	26,188	24,472
Loss from discontinued operations, net of tax	(330)	(312)	(665)	(575)
Gain (loss) on disposal of discontinued operations, net of tax	290	(27)	290	(501)
Net income	$ 6,645	$ 6,107	$ 25,813	$ 23,396
Basic:
Continuing operations	$ 0.14	$ 0.13	$ 0.54	$ 0.51
Discontinued operations	(0.01)		(0.01)	(0.02)
Net income	0.13	0.13	0.53	0.49
Diluted:
Continuing operations	0.13	0.12	0.51	0.47
Discontinued operations			(0.01)	(0.02)
Net income	$ 0.13	$ 0.12	$ 0.50	$ 0.45
Basic weighted average shares outstanding	49,464	48,273	48,809	48,228
Diluted weighted average shares outstanding	52,024	52,052	51,227	52,352
Comprehensive Income:
Net income	$ 6,645	$ 6,107	$ 25,813	$ 23,396
Other comprehensive (loss) income, net of tax	(92)	88	46	97
Comprehensive income	$ 6,553	$ 6,195	$ 25,859	$ 23,493