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CONSOLIDATED STATEMENTS OF NET INCOME (unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
CONSOLIDATED STATEMENTS OF NET INCOME (unaudited) [Abstract]        
Net patient revenues $ 76,470 $ 65,227 $ 144,867 $ 126,659
Other revenues 1,731 1,642 3,101 2,966
Net revenues 78,201 66,869 147,968 129,625
Clinic operating costs:        
Salaries and related costs 40,109 35,526 78,051 69,585
Rent, clinic supplies, contract labor and other 15,205 12,550 29,421 25,284
Provision for doubtful accounts 1,054 1,198 2,004 2,295
Closure costs (2) 8 11 26
Total clinic operating costs 56,366 49,282 109,487 97,190
Gross margin 21,835 17,587 38,481 32,435
Corporate office costs 7,614 6,528 14,746 12,941
Operating income from continuing operations 14,221 11,059 23,735 19,494
Interest and other income, net 0 1 1 3
Interest expense (332) (130) (585) (265)
Income before taxes from continuing operations 13,889 10,930 23,151 19,232
Provision for income taxes 4,469 3,288 7,408 5,781
Net income from continuing operations including non-controlling interests 9,420 7,642 15,743 13,451
Discontinued operations, net of tax 0 (268) 0 (468)
Net income including non-controlling interests 9,420 7,374 15,743 12,983
Less: net income attributable to non-controlling interests (2,988) (2,460) (5,083) (4,348)
Net income attributable to common shareholders 6,432 4,914 10,660 8,635
Basic earnings per share attributable to common shareholders:        
From continuing operations (in dollars per share) $ 0.53 $ 0.42 $ 0.88 $ 0.74
Revaluation of redeemable non-controlling interests, net of tax (in dollars per share) $ (0.01) $ 0 $ (0.09) $ 0
From discontinued operations (in dollars per share) $ 0 $ (0.01) $ 0 $ (0.02)
Basic (in dollars per share) $ 0.52 $ 0.41 $ 0.79 $ 0.72
Diluted earnings per share attributable to common shareholders:        
From continuing operations (in dollars per share) $ 0.53 $ 0.42 $ 0.87 $ 0.74
Revaluation of redeemable non-controlling interests, net of tax (in dollars per share) $ (0.01) $ 0 $ (0.09) $ 0
From discontinued operations (in dollars per share) $ 0 $ (0.01) $ 0 $ (0.02)
Diluted (in dollars per share) $ 0.52 $ 0.41 $ 0.78 $ 0.72
Shares used in computation:        
Basic (in shares) 12,224 12,089 12,177 12,022
Diluted (in shares) 12,226 12,110 12,184 12,044
Dividends declared per common share (in dollars per share) $ 0.12 $ 0.10 $ 0.24 $ 0.20
Earnings attributable to common shareholders:        
From continuing operations 6,432 5,079 10,660 8,930
From discontinued operations 0 (165) 0 (295)
Net income attributable to common shareholders $ 6,432 $ 4,914 $ 10,660 $ 8,635