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CONSOLIDATED STATEMENTS OF NET INCOME (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Income Statement [Abstract]        
Net patient revenues $ 64,368 $ 60,719 $ 191,027 $ 183,048
Other revenues 1,461 1,383 4,426 4,222
Net revenues 65,829 62,102 195,453 187,270
Clinic operating costs:        
Salaries and related costs 35,733 33,037 105,318 97,974
Rent, clinic supplies, contract labor and other 12,878 12,368 38,161 37,051
Provision for doubtful accounts 1,095 1,250 3,390 3,638
Closure costs (5) 5 21 76
Total clinic operating costs 49,701 46,660 146,890 138,739
Gross margin 16,128 15,442 48,563 48,531
Corporate office costs 6,224 5,907 19,165 18,426
Operating income from continuing operations 9,904 9,535 29,398 30,105
Interest and other income, net 2 1 5 4
Interest expense (133) (142) (398) (449)
Income before taxes from continuing operations 9,773 9,394 29,005 29,660
Provision for income taxes 3,017 2,992 8,798 9,052
Net income from continuing operations including non-controlling interests 6,756 6,402 20,207 20,608
Discontinued operations, net of tax (4,497) (104) (4,965) (184)
Net income including non-controlling interests 2,259 6,298 15,242 20,424
Less: net income attributable to non-controlling interests (2,032) (1,735) (6,380) (6,534)
Net income attributable to common shareholders 227 4,563 8,862 13,890
Basic earnings per share attributable to common shareholders:        
From continuing operations $ 0.38 $ 0.39 $ 1.13 $ 1.19
From discontinued operations $ (0.36) $ 0.00 $ (0.39) $ (0.01)
Basic $ 0.02 $ 0.39 $ 0.74 $ 1.18
Diluted earnings per share attributable to common shareholders:        
From continuing operations $ 0.38 $ 0.38 $ 1.12 $ 1.18
From discontinued operations $ (0.36) $ 0.00 $ (0.39) $ (0.01)
Diluted $ 0.02 $ 0.38 $ 0.73 $ 1.17
Shares used in computation:        
Basic 12,106 11,827 12,050 11,778
Diluted 12,120 11,928 12,069 11,892
Dividends declared per common share $ 0.10 $ 0.09 $ 0.30 $ 0.27
Earnings attributable to common shareholders:        
From continuing operations 4,659 4,622 13,589 13,982
From discontinued operations (4,432) (59) (4,727) (92)
Net income attributable to common shareholders $ 227 $ 4,563 $ 8,862 $ 13,890