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CONSOLIDATED STATEMENTS OF NET INCOME - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
CONSOLIDATED STATEMENTS OF NET INCOME [Abstract]      
Net patient revenues $ 324,293 $ 299,009 $ 258,283
Other revenues 7,009 6,065 5,775
Net revenues 331,302 305,074 264,058
Clinic operating costs:      
Salaries and related costs 180,514 163,417 141,840
Rent, clinic supplies, contract labor and other 68,046 61,209 52,887
Provision for doubtful accounts 4,170 4,112 4,384
Closure costs 211 169 246
Total clinic operating costs 252,941 228,907 199,357
Gross margin 78,361 76,167 64,701
Corporate office costs 31,067 30,399 25,931
Operating income from continuing operations 47,294 45,768 38,770
Interest and other income, net 81 18 7
Interest expense (1,031) (1,088) (538)
Income before taxes from continuing operations 46,344 44,698 38,239
Provision for income taxes 14,653 14,274 12,236
Net income from continuing operations including non-controlling interests 31,691 30,424 26,003
Discontinued operations, net of tax benefit of $-0-, $-0- and $3,180. 0 0 (5,007)
Net income including non-controlling interests 31,691 30,424 20,996
Less: net income attributable to non-controlling interests (9,412) (9,571) (8,273)
Net income attributable to common shareholders $ 22,279 $ 20,853 $ 12,723
Basic earnings per share attributable to common shareholders      
Prior to revaluation of redeemable non-controlling interests, net of tax (in dollars per share) $ 1.80 $ 1.71 $ 1.45
Charges to additional-paid-in-capital - revaluation of non-controlling interests, net of tax (in dollars per share) (0.03) (0.09) 0
From continuing operations, net of tax (in dollars per share) 1.77 1.62 1.45
From discontinued operations, net of tax (in dollars per share) 0 0 (0.40)
Basic (in dollars per share) 1.77 1.62 1.05
Diluted earnings per share attributable to common shareholders      
Prior to revaluation of redeemable non-controlling interests, net of tax (in dollars per share) 1.80 1.71 1.45
Charges to additional-paid-in-capital - revaluation of non-controlling interests, net of tax (in dollars per share) (0.03) (0.09) 0
From continuing operations, net of tax (in dollars per share) 1.77 1.62 1.45
From discontinued operations, net of tax (in dollars per share) 0 0 (0.40)
Diluted (in dollars per share) $ 1.77 $ 1.62 $ 1.05
Shares used in computation      
Basic (in shares) 12,392 12,217 12,063
Diluted (in shares) 12,392 12,221 12,082
Dividends declared per common share (in dollars per share) $ 0.60 $ 0.48 $ 0.40
Earnings attributable to common shareholders      
From continuing operations $ 22,279 $ 20,853 $ 17,492
From discontinued operations 0 0 (4,769)
Net income attributable to common shareholders $ 22,279 $ 20,853 $ 12,723