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Lines of Business (Tables)
 6 Months Ended
Jun. 30, 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
June 30, 2016
 
 
 
 
 
 
 
 
 
 
 
External revenue
$
540,376

 
$
93,265

 
$
18,656

 
$
—

 
$
1,192

 
$
653,489

Intercompany revenue
—

 
18,795

 
4,741

 
—

 
(23,536
)
 
—

Total revenue
540,376

 
112,060

 
23,397

 
—

 
(22,344
)
 
653,489

Direct costs
445,697

 
51,513

 
14,480

 
—

 
(22,149
)
 
489,541

Gross profit
94,679

 
60,547

 
8,917

 
—

 
(195
)
 
163,948

Selling, general and administrative expense
14,277

 
9,702

 
6,022

 
18,189

 
—

 
48,190

Operating income (loss) before sale or disposal of assets
80,402

 
50,845

 
2,895

 
(18,189
)
 
(195
)
 
115,758

Net (gain) loss on sale or disposal of assets
(132
)
 
(35
)
 
3

 
(107
)
 
—

 
(271
)
Operating income (loss)
$
80,534

 
$
50,880

 
$
2,892

 
$
(18,082
)
 
$
(195
)
 
$
116,029

Depreciation and amortization
$
21,875

 
$
2,839

 
$
904

 
$
668

 
$
(597
)
 
$
25,689

Property and equipment additions
$
25,486

 
$
4,750

 
$
1,485

 
$
2,336

 
$
(1,049
)
 
$
33,008

Three Months Ended
June 30, 2015
 
 
 
 
 
 
 
 
 
 
 
External revenue
$
435,376

 
$
89,707

 
$
22,818

 
$
—

 
$
884

 
$
548,785

Intercompany revenue
—

 
16,515

 
5,851

 
—

 
(22,366
)
 
—

Total revenue
435,376

 
106,222

 
28,669

 
—

 
(21,482
)
 
548,785

Direct costs
361,991

 
49,519

 
17,280

 
—

 
(20,852
)
 
407,938

Gross profit
73,385

 
56,703

 
11,389

 
—

 
(630
)
 
140,847

Selling, general and administrative expense
10,453

 
9,487

 
7,741

 
16,804

 
—

 
44,485

Operating income (loss) before sale or disposal of assets
62,932

 
47,216

 
3,648

 
(16,804
)
 
(630
)
 
96,362

Net (gain) loss on sale or disposal of assets
(914
)
 
35

 
11

 
49

 
—

 
(819
)
Operating income (loss)
$
63,846


$
47,181

 
$
3,637

 
$
(16,853
)
 
$
(630
)
 
$
97,181

Depreciation and amortization
$
16,440

 
$
2,705

 
$
1,176

 
$
575

 
$
(530
)
 
$
20,366

Property and equipment additions
$
13,995

 
$
2,862

 
$
500

 
$
1,512

 
$
(874
)
 
$
17,995













8.
Lines of Business, continued

 
Animal
Hospital
 
Laboratory
 
All Other
 
Corporate
 

Eliminations
 
Total
Six Months Ended
June 30, 2016
 
 
 
 
 
 
 
 
 
 
 
External revenue
$
998,999

 
$
182,505

 
$
33,110

 
$
—

 
$
2,314

 
$
1,216,928

Intercompany revenue
—

 
36,282

 
9,700

 
—

 
(45,982
)
 
—

Total revenue
998,999

 
218,787

 
42,810

 
—

 
(43,668
)
 
1,216,928

Direct costs
830,903

 
101,524

 
26,983

 
—

 
(43,210
)
 
916,200

Gross profit
168,096

 
117,263

 
15,827

 
—

 
(458
)
 
300,728

Selling, general and administrative expense
26,362

 
19,998

 
11,321

 
40,637

 
—

 
98,318

Operating income (loss) before sale or disposal of assets
141,734

 
97,265

 
4,506

 
(40,637
)
 
(458
)
 
202,410

Net loss (gain) on sale or disposal of assets
443

 
(35
)
 
3

 
(119
)
 
—

 
292

Operating income (loss)
$
141,291

 
$
97,300

 
$
4,503

 
$
(40,518
)
 
$
(458
)
 
$
202,118

Depreciation and amortization
$
39,448

 
$
5,620

 
$
1,787

 
$
1,306

 
$
(1,183
)
 
$
46,978

Property and equipment additions
$
44,030

 
$
9,402

 
$
2,092

 
$
5,187

 
$
(1,897
)
 
$
58,814

Six Months Ended
June 30, 2015
 
 
 
 
 
 
 
 
 
 
 
External revenue
$
828,402

 
$
168,516

 
$
49,351

 
$
—

 
$
1,969

 
$
1,048,238

Intercompany revenue
—

 
31,678

 
13,545

 
—

 
(45,223
)
 
—

Total revenue
828,402

 
200,194

 
62,896

 
—

 
(43,254
)
 
1,048,238

Direct costs
699,533

 
95,509

 
40,083

 
—

 
(41,596
)
 
793,529

Gross profit
128,869

 
104,685

 
22,813

 
—

 
(1,658
)
 
254,709

Selling, general and administrative expense
21,674

 
18,352

 
16,428

 
32,429

 
—

 
88,883

Operating income (loss) before sale or disposal of assets
107,195

 
86,333

 
6,385

 
(32,429
)
 
(1,658
)
 
165,826

Net (gain) loss on sale or disposal of assets
(620
)
 
41

 
20

 
75

 
—

 
(484
)
Operating income (loss)
$
107,815

 
$
86,292

 
$
6,365

 
$
(32,504
)
 
$
(1,658
)
 
$
166,310

Depreciation and amortization
$
32,512

 
$
5,209

 
$
2,328

 
$
1,167

 
$
(1,053
)
 
$
40,163

Property and equipment additions
$
26,077

 
$
6,078

 
$
1,300

 
$
2,576

 
$
(1,510
)
 
$
34,521

 
 
 
 
 
 
 
 
 
 
 
 
At June 30, 2016
 
 
 
 
 
 
 
 
 
 
 
Total assets
$
2,888,883

 
$
326,719

 
$
68,336

 
$
1,338,562

 
$
(1,443,373
)
 
$
3,179,127

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

 
$
306,296

 
$
73,491

 
$
471,112

 
$
(536,726
)
 
$
2,501,132