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Consolidated Statements of Net Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Consolidated Statements of Net Income [Abstract]      
Net patient revenues $ 244,443 $ 226,579 $ 204,101
Other revenues 7,645 10,427 7,132
Net revenues 252,088 237,006 211,233
Clinic operating costs:      
Salaries and related costs 132,824 125,117 110,872
Rent, clinic supplies, contract labor and other 51,620 47,396 40,944
Provision for doubtful accounts 4,848 3,785 3,241
Closure costs 211 59 163
Total clinic operating costs 189,503 176,357 155,220
Gross margin 62,585 60,649 56,013
Corporate office costs 24,782 24,718 22,823
Operating income 37,803 35,931 33,190
Interest and other income, net 6 5,445 586
Interest expense (557) (496) (236)
Income from operations 37,252 40,880 33,540
Provision for income taxes 11,034 11,097 8,840
Net income including noncontrolling interests 26,218 29,783 24,700
Less: net income attributable to noncontrolling interests (8,285) (8,809) (9,055)
Net income attributable to common shareholders $ 17,933 $ 20,974 $ 15,645
Earnings per share attributable to common shareholders:      
Basic $ 1.52 $ 1.78 $ 1.34
Diluted $ 1.51 $ 1.75 $ 1.32
Shares used in computation:      
Basic 11,804 11,814 11,638
Diluted 11,904 11,977 11,870
Dividends declared per common share $ 0.76 $ 0.32