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Lines of Business (Tables)
 3 Months Ended
Mar. 31, 2015
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, 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

Three Months Ended
March 31, 2014
 
 
 
 
 
 
 
 
 
 
 
External revenue
$
351,588

 
$
74,783

 
$
22,201

 
$
—

 
$
935

 
$
449,507

Intercompany revenue
—

 
13,751

 
5,920

 
—

 
(19,671
)
 
—

Total revenue
351,588

 
88,534

 
28,121

 
—

 
(18,736
)
 
449,507

Direct costs
302,788

 
45,503

 
18,152

 
—

 
(18,387
)
 
348,056

Gross profit
48,800

 
43,031

 
9,969

 
—

 
(349
)
 
101,451

Selling, general and administrative expense
9,128

 
8,018

 
8,348

 
15,946

 
—

 
41,440

Operating income (loss) before sale or disposal of assets
39,672

 
35,013

 
1,621

 
(15,946
)
 
(349
)
 
60,011

Net loss (gain) on sale or disposal of assets
168

 
(71
)
 
(1,184
)
 
(134
)
 
—

 
(1,221
)
Operating income (loss)
$
39,504


$
35,084

 
$
2,805

 
$
(15,812
)
 
$
(349
)
 
$
61,232

Depreciation and amortization
$
14,742

 
$
2,535

 
$
2,136

 
$
819

 
$
(465
)
 
$
19,767

Property and equipment additions
$
13,068

 
$
1,981

 
$
758

 
$
1,411

 
$
(599
)
 
$
16,619


At March 31, 2015
 
 
 
 
 
 
 
 
 
 
 
Total assets
$
2,037,578

 
$
294,826

 
$
85,645

 
$
273,051

 
$
(366,098
)
 
$
2,325,002

At December 31, 2014
 
 
 
 
 
 
 
 
 
 
 
Total assets
$
2,021,725

 
$
258,550

 
$
89,596

 
$
270,414

 
$
(308,265
)
 
$
2,332,020