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Acquisitions and divestitures (Tables)
 3 Months Ended
Mar. 31, 2017
Business Acquisition [Line Items]  
Reconciliation of Changes in Contingent Earn-Out Obligations
The following is a reconciliation of changes in the contingent earn-out obligations for the three months ended March 31, 2017:
 
Beginning balance, January 1, 2017
$
9,977

Contingent earn-out obligations associated with acquisitions
1,053

Remeasurement of fair value for contingent earn-out obligations
102

Payments on contingent earn-out obligations
(2,567
)
 
$
8,565
Dialysis businesses and other businesses  
Business Acquisition [Line Items]  
Aggregate Purchase Cost Allocations for Acquisitions
The following table summarizes the assets acquired and liabilities assumed in these transactions and recognized at their acquisition dates at estimated fair values: 
Current assets
$
1,123

Property and equipment
5,604

Amortizable intangible and other long-term assets
6,173

Goodwill
78,729

Noncontrolling interests assumed
(8,052
)
Deferred income taxes
(2,194
)
Liabilities assumed
(447
)
Aggregate purchase price
$
80,936