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CONSOLIDATED STATEMENTS OF NET INCOME (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income Statement [Abstract]      
Net patient revenues $ 258,283 $ 244,100 $ 225,804
Other revenues 5,775 5,551 5,719
Net revenues 264,058 249,651 231,523
Clinic operating costs:      
Salaries and related costs 141,840 131,604 124,820
Rent, clinic supplies, contract labor and other 52,887 50,102 46,998
Provision for doubtful accounts 4,384 4,824 3,778
Closure costs 246 211 59
Total clinic operating costs 199,357 186,741 175,655
Gross margin 64,701 62,910 55,868
Corporate office costs 25,931 24,504 24,440
Operating income from continuing operations 38,770 38,406 31,428
Interest and other income, net 7 6 5,445
Interest expense (538) (557) (496)
Income before taxes from continuing operations 38,239 37,855 36,377
Provision for income taxes 12,236 11,215 9,698
Net income from continuing operations including non-controlling interests 26,003 26,640 26,679
Discontinued operations, net of tax benefit of $3,180 and $181 and provision of $1,399 (5,007) (423) 3,104
Net income including non-controlling interests 20,996 26,217 29,783
Less: net income attributable to non-controlling interests (8,273) (8,284) (8,809)
Net income attributable to common shareholders 12,723 17,933 20,974
Basic earnings per share attributable to common shareholders:      
From continuing operations $ 1.45 $ 1.54 $ 1.60
From discontinued operations $ (0.40) $ (0.02) $ 0.18
Basic $ 1.05 $ 1.52 $ 1.78
Diluted earnings per share attributable to common shareholders:      
From continuing operations $ 1.45 $ 1.53 $ 1.57
From discontinued operations $ (0.40) $ (0.02) $ 0.18
Diluted $ 1.05 $ 1.51 $ 1.75
Shares used in computation:      
Basic 12,063 11,804 11,814
Diluted 12,082 11,904 11,977
Dividends declared per common share $ 0.40 $ 0.76 $ 0.32
Earnings attributable to common shareholders:      
From continuing operations 17,492 18,212 18,812
From discontinued operations (4,769) (279) 2,162
Net income attributable to common shareholders $ 12,723 $ 17,933 $ 20,974