Selected Quarterly Financial Information (Tables)

12 Months Ended

Dec. 31, 2011

Dec. 31, 2010


	2011 Quarters
	First			Second			Third			Fourth
Net patient service revenue	$	382,283		$	393,402		$	407,665		$	404,898

Operating expenses:
Practice salaries and benefits		243,894			235,292			246,687			244,523
Practice supplies and other operating expenses		15,090			16,253			16,718			18,754
General and administrative expenses		41,798			42,702			43,010			42,846
Depreciation and amortization		5,781			6,032			6,213			7,266

Total operating expenses		306,563			300,279			312,628			313,389

Income from operations		75,720			93,123			95,037			91,509

Investment income		325			329			337			504
Interest expense		(911	)		(988	)		(1,056	)		(684	)

Income before income taxes		75,134			92,464			94,318			91,329

Income tax provision		29,678			36,523			36,077			32,970

Net income	$	45,456		$	55,941		$	58,241		$	58,359

Per common and common equivalent share data (1):
Net income:
Basic	$	0.96		$	1.18		$	1.21		$	1.21

Diluted	$	0.94		$	1.15		$	1.19		$	1.19

Weighted average shares:
Basic		47,149			47,531			47,990			48,126

Diluted		48,361			48,730			48,935			49,132

(1)	Basic and diluted per share amounts are computed for each of the periods presented. Accordingly, the sum of the quarterly per share amounts may not agree with the full year amount.


	2010 Quarters
	First			Second			Third			Fourth
Net patient service revenue	$	332,927		$	349,094		$	351,058		$	368,480

Operating expenses:
Practice salaries and benefits		213,402			208,762			211,884			220,872
Practice supplies and other operating expenses		13,095			14,062			13,980			16,374
General and administrative expenses		38,099			39,164			37,499			39,505
Depreciation and amortization		4,780			5,006			6,321			5,843

Total operating expenses		269,376			266,994			269,684			282,594

Income from operations		63,551			82,100			81,374			85,886

Investment income		404			265			438			327
Interest expense		(710	)		(1,118	)		(481	)		(884	)

Income before income taxes		63,245			81,247			81,331			85,329

Income tax provision		24,982			31,889			20,061			31,529

Net income	$	38,263		$	49,358		$	61,270		$	53,800

Per common and common equivalent share data (1):
Net income:
Basic	$	0.83		$	1.06		$	1.31		$	1.15

Diluted	$	0.81		$	1.04		$	1.29		$	1.12

Weighted average shares:
Basic		46,300			46,516			46,788			46,914

Diluted		47,267			47,528			47,482			47,998

(1)	Basic and diluted per share amounts are computed for each of the periods presented. Accordingly, the sum of the quarterly per share amounts may not agree with the full year amount.