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Lines of Business (Tables)
 3 Months Ended
Mar. 31, 2016
Segment Reporting [Abstract]  
Lines of Business
The following is a summary of certain financial data for each of our segments (in thousands):

 
Animal
Hospital
 
Laboratory
 
All Other
 
Corporate
 

Eliminations
 
Total
Three Months Ended
March 31, 2016
 
 
 
 
 
 
 
 
 
 
 
External revenue
$
458,623

 
$
89,240

 
$
14,454

 
$
—

 
$
1,122

 
$
563,439

Intercompany revenue
—

 
17,487

 
4,959

 
—

 
(22,446
)
 
—

Total revenue
458,623

 
106,727

 
19,413

 
—

 
(21,324
)
 
563,439

Direct costs
385,206

 
50,011

 
12,503

 
—

 
(21,061
)
 
426,659

Gross profit
73,417

 
56,716

 
6,910

 
—

 
(263
)
 
136,780

Selling, general and administrative expense
12,085

 
10,296

 
5,299

 
22,448

 
—

 
50,128

Operating income (loss) before sale or disposal of assets
61,332

 
46,420

 
1,611

 
(22,448
)
 
(263
)
 
86,652

Net loss (gain) on sale or disposal of assets
575

 
—

 
—

 
(12
)
 
—

 
563

Operating income (loss)
$
60,757

 
$
46,420

 
$
1,611

 
$
(22,436
)
 
$
(263
)
 
$
86,089

Depreciation and amortization
$
17,573

 
$
2,781

 
$
883

 
$
638

 
$
(586
)
 
$
21,289

Property and equipment additions
$
18,544

 
$
4,652

 
$
607

 
$
2,851

 
$
(848
)
 
$
25,806

Three Months Ended
March 31, 2015
 
 
 
 
 
 
 
 
 
 
 
External revenue
$
393,026

 
$
78,809

 
$
26,533

 
$
—

 
$
1,085

 
$
499,453

Intercompany revenue
—

 
15,163

 
7,694

 
—

 
(22,857
)
 
—

Total revenue
393,026

 
93,972

 
34,227

 
—

 
(21,772
)
 
499,453

Direct costs
337,542

 
45,990

 
22,803

 
—

 
(20,744
)
 
385,591

Gross profit
55,484

 
47,982

 
11,424

 
—

 
(1,028
)
 
113,862

Selling, general and administrative expense
11,221

 
8,865

 
8,687

 
15,625

 
—

 
44,398

Operating income (loss) before sale or disposal of assets
44,263

 
39,117

 
2,737

 
(15,625
)
 
(1,028
)
 
69,464

Net loss on sale or disposal of assets
294

 
6

 
9

 
26

 
—

 
335

Operating income (loss)
$
43,969


$
39,111

 
$
2,728

 
$
(15,651
)
 
$
(1,028
)
 
$
69,129

Depreciation and amortization
$
16,072

 
$
2,504

 
$
1,152

 
$
592

 
$
(523
)
 
$
19,797

Property and equipment additions
$
12,082

 
$
3,216

 
$
800

 
$
1,064

 
$
(636
)
 
$
16,526



At March 31,2016
 
 
 
 
 
 
 
 
 
 
 
Total assets
$
2,377,077

 
$
322,776

 
$
69,589

 
$
586,394

 
$
(692,161
)
 
$
2,663,675

At December 31, 2015
 
 
 
 
 
 
 
 
 
 
 
Total assets
$
2,186,959

 
$
306,296

 
$
73,491

 
$
471,112

 
$
(536,726
)
 
$
2,501,132