Selected Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2011

Selected Quarterly Financial Data (Unaudited)

Selected Quarterly Financial Data (Unaudited)

12. Selected Quarterly Financial Data (Unaudited)

        The following is a summary of the unaudited quarterly results of operations for the years ended December 31, 2010 and 2011 (in thousands, except per share amounts):

	For the Quarter Ended
	March 31, 2010			June 30, 2010			September 30, 2010			December 31, 2010
Fiscal Year Ended December 31, 2010
Net revenue	$	728,053		$	741,658		$	750,319		$	749,210
Cost and expenses:
Cost of care		476,679			472,478			467,160			491,668
Cost of goods sold		56,296			54,771			55,071			52,492
Direct service costs and other operating expenses(1)		138,254			139,617			141,581			147,130
Depreciation and amortization		13,422			14,235			13,950			13,075
Interest expense		685			584			482			482
Interest income		(817	)		(803	)		(846	)		(809	)
		684,519			680,882			677,398			704,038
Income before income taxes		43,534			60,776			72,921			45,172
Provision for income taxes		18,015			25,348			28,137			12,244
Net income	$	25,519		$	35,428		$	44,784		$	32,928
Weighted average number of common shares outstanding—basic		34,382			33,323			33,450			33,971
Weighted average number of common shares outstanding—diluted		35,074			33,800			34,171			34,730
Net income per common share—basic:	$	0.74		$	1.06		$	1.34		$	0.97
Net income per common share—diluted:	$	0.73		$	1.05		$	1.31		$	0.95

	For the Quarter Ended
	March 31, 2011			June 30, 2011			September 30, 2011			December 31, 2011
Fiscal Year Ended December 31, 2011
Net revenue	$	692,755		$	698,338		$	686,843		$	721,464
Cost and expenses:
Cost of care		433,700			441,446			448,051			461,527
Cost of goods sold		56,519			53,404			57,636			64,479
Direct service costs and other operating expenses(2)		131,567			131,779			130,038			136,250
Depreciation and amortization		13,952			14,267			15,069			15,335
Interest expense		471			494			457			1,080
Interest income		(815	)		(858	)		(592	)		(516	)
		635,394			640,532			650,659			678,155
Income before income taxes		57,361			57,806			36,184			43,309
Provision for income taxes		23,063			23,575			4,829			13,570
Net income	$	34,298		$	34,231		$	31,355		$	29,739
Weighted average number of common shares outstanding—basic		33,051			31,301			29,900			27,724
Weighted average number of common shares outstanding—diluted		33,656			31,903			30,438			28,300
Net income per common share—basic:	$	1.04		$	1.09		$	1.05		$	1.07
Net income per common share—diluted:	$	1.02		$	1.07		$	1.03		$	1.05

(1)

Includes stock compensation expense of $4,528, $3,706, $3,596 and $3,272 for the quarters ended March 31, June 30, September 30, and December 31, 2010, respectively.

(2)

Includes stock compensation expense of $4,778, $4,205, $4,425 and $4,010 for the quarters ended March 31, June 30, September 30, and December 31, 2011, respectively.