Condensed Consolidated Statements of Operations (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Income Statement [Abstract]
Revenue	$ 350,440	$ 332,155
Cost of services	263,832	255,006
Gross profit	86,608	77,149
Selling, general and administrative expenses	36,845	35,404
Amortization of intangible assets	6,922	7,734
Income from operations	42,841	34,011	[1]
Interest income	38	15
Interest expense	(10,069)	(8,742)
Income before income taxes	32,810	25,284
Income tax expense	(10,278)	(9,236)
Net income	$ 22,532	$ 16,048
Earnings per common share:
Common stock-basic (usd per share)	$ 0.36	$ 0.24
Common stock-diluted (usd per share)	$ 0.35	$ 0.24
Weighted average number of common shares outstanding:
Common stock-basic (shares)	61,682,964	65,407,851
Common stock-diluted (shares)	63,189,367	67,209,378

[1] (1) For the three months ended March 31, 2014, income from operations includes secondary offering expenses of $0.6 million which has been allocated to full service center-based care.