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CONSOLIDATED STATEMENTS OF NET INCOME (unaudited) - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
CONSOLIDATED STATEMENTS OF NET INCOME (unaudited) [Abstract]    
Net patient revenues $ 85,049 $ 75,807
Other revenues 1,859 1,434
Net revenues 86,908 77,241
Clinic operating costs:    
Salaries and related costs 47,804 43,052
Rent, clinic supplies, contract labor and other 17,507 16,325
Provision for doubtful accounts 1,089 990
Closure costs 13 32
Total clinic operating costs 66,413 60,399
Gross margin 20,495 16,842
Corporate office costs 9,004 7,657
Operating income 11,491 9,185
Interest and other income, net 20 8
Interest expense (308) (265)
Income before taxes 11,203 8,928
Provision for income taxes 3,523 2,777
Net income including non-controlling interests 7,680 6,151
Less: net income attributable to non-controlling interests (2,352) (1,985)
Net income attributable to common shareholders $ 5,328 $ 4,166
Basic earnings per share attributable to common shareholders (in dollars per share) $ 0.43 $ 0.34
Diluted earnings per share attributable to common shareholders (in dollars per share) $ 0.43 $ 0.34
Shares used in computation:    
Basic (in shares) 12,448 12,313
Diluted (in shares) 12,448 12,313
Dividends declared per common share (in dollars per share) $ 0.17 $ 0.15