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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

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