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CONSOLIDATED STATEMENTS OF NET INCOME (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Income Statement [Abstract]        
Net patient revenues $ 65,295 $ 62,052 $ 126,800 $ 122,551
Other revenues 1,929 1,907 3,522 3,990
Net revenues 67,224 63,959 130,322 126,541
Clinic operating costs:        
Salaries and related costs 35,813 32,671 70,228 65,470
Rent, clinic supplies, contract labor and other 12,904 12,992 25,822 25,476
Provision for doubtful accounts 1,193 1,280 2,282 2,397
Closure costs 8 22 26 71
Total clinic operating costs 49,918 46,965 98,358 93,414
Gross margin 17,306 16,994 31,964 33,127
Corporate office costs 6,622 6,396 13,129 12,658
Operating income 10,684 10,598 18,835 20,469
Interest and other income, net 1 1 3 3
Interest expense (130) (145) (265) (307)
Income before taxes 10,555 10,454 18,573 20,165
Provision for income taxes 3,181 3,140 5,590 6,039
Net income including noncontrolling interests 7,374 7,314 12,983 14,126
Less: net income attributable to noncontrolling interests (2,460) (2,465) (4,348) (4,799)
Net income attributable to common shareholders $ 4,914 $ 4,849 $ 8,635 $ 9,327
Earnings per share attributable to common shareholders:        
Basic $ 0.41 $ 0.41 $ 0.72 $ 0.79
Diluted $ 0.41 $ 0.41 $ 0.72 $ 0.79
Shares used in computation:        
Basic 12,089 11,781 12,022 11,754
Diluted 12,110 11,903 12,044 11,872
Dividends declared per common share $ 0.10 $ 0.09 $ 0.20 $ 0.18