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Acquisitions and divestitures (Tables)
6 Months Ended
Jun. 30, 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 six months ended June 30, 2017:
 
Beginning balance, January 1, 2017
$
9,977

Contingent earn-out obligations associated with acquisitions
3,849

Remeasurement of fair value for contingent earn-out obligations
415

Payments on contingent earn-out obligations
(2,567
)
 
$
11,674

Dialysis 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
$
7,439

Property and equipment
13,278

Amortizable intangible and other long-term assets
14,180

Non-amortizable intangibles
4,833

Goodwill
276,182

Current liabilities
(6,467
)
Long-term liabilities
(2,484
)
Noncontrolling interests
(36,075
)

$
270,886

Renal Ventures  
Business Acquisition [Line Items]  
Aggregate Purchase Cost Allocations for Acquisitions
The following table summarizes the assets acquired and liabilities assumed in the transactions and recognized at the acquisition date at estimated fair values: 
Current assets
$
24,529

Property and equipment
36,295

Amortizable intangible and other long-term assets
11,547

Goodwill
296,582

Current liabilities
(6,912
)
Long-term liabilities
(478
)

$
361,563