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CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Net patient service revenue $ 502,715 $ 422,616
Operating expenses:    
Practice salaries and benefits 329,201 272,261
Practice supplies and other operating expenses 19,500 16,985
General and administrative expenses 53,318 46,869
Depreciation and amortization 9,144 7,113
Total operating expenses 411,163 343,228
Income from operations 91,552 79,388
Investment income 402 428
Interest expense (1,189) (554)
Income before income taxes 90,765 79,262
Income tax provision 35,398 30,912
Net income $ 55,367 $ 48,350
Net income:    
Basic $ 1.12 $ 1.00
Diluted $ 1.10 $ 0.98
Weighted average shares:    
Basic 49,309 48,269
Diluted 50,392 49,399