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Consolidated Statements of Net Income (Unaudited) (USD $)
In Thousands, except Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Consolidated Statements of Net Income [Abstract]        
Net patient revenues $ 62,052 $ 56,678 $ 122,551 $ 110,550
Other revenues 1,907 3,234 3,990 6,103
Net revenues 63,959 59,912 126,541 116,653
Clinic operating costs:        
Salaries and related costs 32,671 31,120 65,470 60,759
Rent, clinic supplies, contract labor and other 12,992 11,388 25,476 22,683
Provision for doubtful accounts 1,280 504 2,397 1,128
Closure costs 22 11 71 31
Total clinic operating costs 46,965 43,023 93,414 84,601
Gross margin 16,994 16,889 33,127 32,052
Corporate office costs 6,396 6,007 12,658 12,488
Operating income 10,598 10,882 20,469 19,564
Interest and other income, net 1 2 3 4
Interest expense (145) (109) (307) (182)
Income before taxes 10,454 10,775 20,165 19,386
Provision for income taxes 3,140 3,172 6,039 5,598
Net income including noncontrolling interests 7,314 7,603 14,126 13,788
Less: net income attributable to noncontrolling interests (2,465) (2,703) (4,799) (5,142)
Net income attributable to common shareholders $ 4,849 $ 4,900 $ 9,327 $ 8,646
Earnings per share attributable to common shareholders:        
Basic $ 0.41 $ 0.42 $ 0.79 $ 0.73
Diluted $ 0.41 $ 0.41 $ 0.79 $ 0.72
Shares used in computation:        
Basic 11,781 11,807 11,754 11,767
Diluted 11,903 11,999 11,872 11,978
Dividends declared per common share $ 0.09 $ 0.08 $ 0.18 $ 0.16