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Earnings per share | 6 Months Ended
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Jun. 30, 2017
Earnings Per Share [Abstract] |
Earnings per share | Earnings per share Basic net income per share is calculated by dividing net income attributable to the Company, adjusted for any change in noncontrolling interests redemption rights in excess of fair value, by the weighted average number of common shares and vested stock units outstanding, net of shares held in escrow from the DaVita HealthCare Partners merger that under certain circumstances may be returned to the Company. Diluted net income per share includes the dilutive effect of outstanding stock-settled stock appreciation rights and unvested stock units (under the treasury stock method) as well as contingently returnable shares held in escrow. The reconciliations of the numerators and denominators used to calculate basic and diluted earnings per share are as follows:
| Three months ended June 30, |  | Six months ended June 30,
| 2017 |  | 2016 |  | 2017 |  | 2016
Basic: |  |  |  |  |  |  |  |  |
Net income attributable to DaVita Inc. | $ | 127,001 |  |  | $ | 53,382 |  |  | $ | 574,698 |  |  | $ | 150,816 |
Weighted average shares outstanding during the period | 193,282 |  |  | 206,692 |  |  | 193,923 |  |  | 206,626 |
Contingently returnable shares held in escrow from the DaVita HealthCare Partners merger | (2,194 | ) |  | (2,194 | ) |  | (2,194 | ) |  | (2,194 | )
Weighted average shares for basic earnings per share calculation | 191,088 |  |  | 204,498 |  |  | 191,729 |  |  | 204,432 |
Basic net income per share attributable to DaVita Inc. | $ | 0.66 |  |  | $ | 0.26 |  |  | $ | 3.00 |  |  | $ | 0.74 |
Diluted: |  |  |  |  |  |  |  |  |  |  |
Net income attributable to DaVita Inc. | $ | 127,001 |  |  | $ | 53,382 |  |  | $ | 574,698 |  |  | $ | 150,816 |
Weighted average shares outstanding during the period | 193,282 |  |  | 206,692 |  |  | 193,923 |  |  | 206,626 |
Assumed incremental shares from stock plans | 706 |  |  | 1,355 |  |  | 708 |  |  | 1,362 |
Weighted average shares for diluted earnings per share calculation | 193,988 |  |  | 208,047 |  |  | 194,631 |  |  | 207,988 |
Diluted net income per share attributable to DaVita Inc. | $ | 0.65 |  |  | $ | 0.26 |  |  | $ | 2.95 |  |  | $ | 0.73 |
Anti-dilutive potential common shares excluded from calculation(1) | 3,780 |  |  | 1,811 |  |  | 3,603 |  |  | 2,042 |
(1) | Shares associated with stock-settled stock appreciation rights that are excluded from the diluted denominator calculation because they are anti-dilutive under the treasury stock method.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1278-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64863997&loc=d3e1252-109256 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=65016374&loc=d3e4984-109258 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688 + Details
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