Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2015		Sep. 30, 2014	Sep. 30, 2015		Sep. 30, 2014
Income Statement [Abstract]
Revenue	$ 365,944		$ 334,976	$ 1,086,849		$ 1,015,231
Cost of services	280,560		262,115	818,997		782,107
Gross profit	85,384		72,861	267,852		233,124
Selling, general and administrative expenses	36,419		32,856	110,154		101,464
Amortization of intangible assets	7,224		6,959	20,978		22,068
Income from operations	41,741	[1]	33,046	136,720	[2]	109,592	[3]
Interest income	32		48	117		74
Interest expense	(10,362)		(8,443)	(30,831)		(25,810)
Income before income taxes	31,411		24,651	106,006		83,856
Income tax expense	(10,853)		(9,272)	(35,997)		(30,715)
Net income	$ 20,558		$ 15,379	$ 70,009		$ 53,141
Earnings per common share:
Common stock-basic (usd per share)	$ 0.34		$ 0.23	$ 1.14		$ 0.81
Common stock-diluted (usd per share)	$ 0.33		$ 0.23	$ 1.11		$ 0.79
Weighted average number of common shares outstanding:
Common stock-diluted (shares)	61,846,725		67,635,657	62,631,444		67,433,972

[1] For the three months ended September 30, 2015, income from operations includes secondary offering and completed acquisition expenses of $0.2 million which has been allocated to full service center-based care.

[2] For the nine months ended September 30, 2015, income from operations includes secondary offering and completed acquisition expenses of $0.5 million which has been allocated to full service center-based care.

[3] For the nine months ended September 30, 2014, income from operations includes secondary offering and completed acquisition expenses of $0.6 million which has been allocated to full service center-based care.