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Earnings per share
 6 Months Ended
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.