CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Net revenue	$ 805,473		$ 698,338		$ 1,578,686		$ 1,391,093
Cost and expenses:
Cost of care	521,830		441,446		1,027,123		875,146
Cost of goods sold	82,855		53,404		163,893		109,923
Direct service costs and other operating expenses	140,333	[1]	131,779	[1]	276,922	[1]	263,346	[1]
Depreciation and amortization	15,152		14,267		29,933		28,219
Interest expense	576		494		1,176		965
Interest income	(857)		(858)		(1,269)		(1,673)
Total cost and expenses	759,889		640,532		1,497,778		1,275,926
Income before income taxes	45,584		57,806		80,908		115,167
Provision for income taxes	18,611		23,575		33,145		46,638
Net income	26,973		34,231		47,763		68,529
Net income per common share - basic (See Note B) (in dollars per share)	$ 0.99		$ 1.09		$ 1.75		$ 2.13
Net income per common share - diluted (See Note B) (in dollars per share)	$ 0.97		$ 1.07		$ 1.72		$ 2.09
Other comprehensive income
Unrealized (losses) gains on available-for-sale securities	(85)	[2]	(19)	[2]	88	[2]	78	[2]
Comprehensive income	$ 26,888		$ 34,212		$ 47,851		$ 68,607

[1] Includes stock compensation expense of $4,205 and $4,365 for the three months ended June 30, 2011 and 2012, respectively, and $8,983 and $9,467 for the six months ended June 30, 2011 and 2012, respectively.

[2] Net of income tax provision (benefit) of $(12) and $(55) for the three months ended June 30, 2011 and 2012, respectively, and $49 and $56 for the six months ended June 30, 2011 and 2012, respectively.