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Lines of Business (Tables)
 3 Months Ended
Mar. 31, 2014
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, 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

Capital expenditures
$
13,068

 
$
1,981

 
$
758

 
$
1,411

 
$
(599
)
 
$
16,619

Three Months Ended
March 31, 2013
 
 
 
 
 
 
 
 
 
 
 
External revenue
$
340,615

 
$
73,638

 
$
23,628

 
$
—

 
$
725

 
$
438,606

Intercompany revenue
—

 
13,697

 
4,895

 
—

 
(18,592
)
 
—

Total revenue
340,615

 
87,335

 
28,523

 
—

 
(17,867
)
 
438,606

Direct costs
295,416

 
44,870

 
18,889

 
—

 
(17,492
)
 
341,683

Gross profit
45,199

 
42,465

 
9,634

 
—

 
(375
)
 
96,923

Selling, general and administrative expense
8,325

 
8,005

 
8,914

 
14,602

 
—

 
39,846

Operating income (loss) before sale or disposal of assets
36,874

 
34,460

 
720

 
(14,602
)
 
(375
)
 
57,077

Net loss (gain) on sale or disposal of assets
1,729

 
(5
)
 
2

 
—

 
—

 
1,726

Operating income (loss)
$
35,145

 
$
34,465

 
$
718

 
$
(14,602
)
 
$
(375
)
 
$
55,351

Depreciation and amortization
$
13,387

 
$
2,507

 
$
1,965

 
$
819

 
$
(439
)
 
$
18,239

Capital expenditures
$
14,441

 
$
1,918

 
$
1,333

 
$
640

 
$
(363
)
 
$
17,969




At March 31, 2014
 
 
 
 
 
 
 
 
 
 
 
Total assets
$
1,864,993

 
$
261,178

 
$
94,145

 
$
70,046

 
$
(40,431
)
 
$
2,249,931

At December 31, 2013
 
 
 
 
 
 
 
 
 
 
 
Total assets
$
1,854,609

 
$
247,591

 
$
96,245

 
$
77,153

 
$
(37,817
)
 
$
2,237,781