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Segment Disclosures (Tables)
 3 Months Ended
Mar. 31, 2018
Segment Reporting [Abstract]  
Summary of Operating Performance of Reportable Segments
The following summarizes the operating performance of our reportable segments (in thousands):
 
System One
 
In-Center
 
Other
 
Services
 
Intersegment Elimination
 
Total
Three Months Ended March 31, 2018
 
 
 
 
 
 
 
 
 
 
 
Revenues from external customers
$
81,702

 
$
17,357

 
$
2,820

 
$
5,419

 
$
—

 
$
107,298

Intersegment revenues
1,185

 
—

 
—

 
—

 
(1,185
)
 
—

Revenues
82,887

 
17,357

 
2,820

 
5,419

 
(1,185
)
 
107,298

Segment profit (loss)
21,720

 
2,299

 
(19,625
)
 
(5,559
)
 
35

 
(1,130
)
Depreciation and amortization
5,435

 
488

 
1,084

 
1,343

 
(46
)
 
8,304

Three Months Ended March 31, 2017
 
 
 
 
 
 
 
 
 
 
 
Revenues from external customers
$
73,274

 
$
15,606

 
$
2,899

 
$
5,050

 
$
—

 
$
96,829

Intersegment revenues
1,387

 
—

 
—

 
—

 
(1,387
)
 
—

Revenues
74,661

 
15,606

 
$
2,899

 
5,050

 
(1,387
)
 
96,829

Segment profit (loss)
19,848

 
2,359

 
(18,261
)
 
(5,605
)
 
(22
)
 
(1,681
)
Depreciation and amortization
5,634

 
525

 
1,072

 
1,268

 
(32
)
 
8,467
Summary of Customers Who Individually Make Up Greater than 10% of Total Revenues
The following table summarizes the number of customers who individually make up greater than ten percent of total revenues:
 
Three Months Ended March 31,
 
2018
 
2017
DaVita
20
%
 
20
%
Fresenius
19
%
 
19
%