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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

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