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Earnings per share
 6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Earnings per share
Earnings per share
Basic earnings per share is calculated by dividing net income attributable to the Company, adjusted for any change in noncontrolling interest redemption rights in excess of fair value, by the weighted average number of common shares, net of shares held in escrow that under certain circumstances may be returned to the Company.
Diluted earnings per share includes the dilutive effect of outstanding stock-settled stock appreciation rights (SSARs) and unvested stock units (under the treasury stock method) as well as shares held in escrow that the Company expects will remain outstanding.
The reconciliations of the numerators and denominators used to calculate basic and diluted earnings per share were as follows:
 
Three months ended
June 30,
 
Six months ended
June 30,
 
2018
 
2017
 
2018
 
2017
Numerators:
 

 
 

 
 
 
 
Net income from continuing operations attributable to DaVita Inc.
$
199,603

 
$
151,292

 
$
390,618

 
$
592,197

Change in noncontrolling interest redemption rights in excess of fair value
(98
)
 
—

 
(98
)
 
—

Net income from continuing operations for basic earnings per share
calculation
199,505

 
151,292

 
390,520

 
592,197

Net income (loss) from discontinued operations attributable to DaVita Inc.
67,673

 
(24,291
)
 
55,344

 
(17,499
)
Net income attributable to DaVita Inc. for basic earnings per share
calculation
$
267,178

 
$
127,001

 
$
445,864

 
$
574,698

Basic:
 
 
 
 
 
 
 
Weighted average shares outstanding during the period
173,811

 
193,282

 
177,461

 
193,923

Contingently returnable shares held in escrow for the DaVita HealthCare
Partners merger
(2,194
)
 
(2,194
)
 
(2,194
)
 
(2,194
)
Weighted average shares for basic earnings per share calculation
171,617

 
191,088

 
175,267

 
191,729

 
 
 
 
 
 
 
 
Basic net income from continuing operations per share attributable to
DaVita Inc.
$
1.16

 
$
0.79

 
$
2.23

 
$
3.09

Basic net income (loss) from discontinued operations per share
attributable to DaVita Inc.
0.40

 
(0.13
)
 
0.31

 
(0.09
)
Basic net income per share attributable to DaVita Inc.
$
1.56

 
$
0.66

 
$
2.54

 
$
3.00

Diluted:
 
 
 
 
 
 
 
Weighted average shares outstanding during the period
173,811

 
193,282

 
177,461

 
193,923

Assumed incremental shares from stock plans
295

 
706

 
489

 
708

Weighted average shares for diluted earnings per share calculation
174,106

 
193,988

 
177,950

 
194,631

 
 
 
 
 
 
 
 
Diluted net income from continuing operations per share attributable to
DaVita Inc.
$
1.15

 
$
0.78

 
$
2.19

 
$
3.04

Diluted net income (loss) from discontinued operations per share
attributable to DaVita Inc.
0.38

 
(0.13
)
 
0.32

 
(0.09
)
Diluted net income per share attributable to DaVita Inc.
$
1.53

 
$
0.65

 
$
2.51

 
$
2.95

Anti-dilutive stock-settled awards excluded from calculation(1)
6,227

 
3,780

 
4,840

 
3,603

 
(1)
Shares associated with stock-settled stock appreciation rights excluded from the diluted denominator calculation because they are antidilutive under the treasury stock method.