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Lines of Business (Tables)
 6 Months Ended
Jun. 30, 2017
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, 2017
 
 
 
 
 
 
 
 
 
 
 
External revenue
$
628,798

 
$
95,269

 
$
18,225

 
$
—

 
$
840

 
$
743,132

Intercompany revenue
—

 
21,932

 
4,308

 
—

 
(26,240
)
 
—

Total revenue
628,798

 
117,201

 
22,533

 
—

 
(25,400
)
 
743,132

Direct costs
516,239

 
53,777

 
13,177

 
—

 
(25,154
)
 
558,039

Gross profit
112,559

 
63,424

 
9,356

 
—

 
(246
)
 
185,093

Selling, general and administrative expense
16,745

 
9,975

 
7,512

 
25,544

 
—

 
59,776

Operating income (loss) before sale or disposal of assets
95,814

 
53,449

 
1,844

 
(25,544
)
 
(246
)
 
125,317

Net loss on sale or disposal of assets
225

 
3

 
2

 
—

 
—

 
230

Operating income (loss)
$
95,589

 
$
53,446

 
$
1,842

 
$
(25,544
)
 
$
(246
)
 
$
125,087

Depreciation and amortization
$
26,486

 
$
3,173

 
$
849

 
$
715

 
$
(704
)
 
$
30,519

Property and equipment additions
$
19,965

 
$
5,042

 
$
359

 
$
1,259

 
$
(906
)
 
$
25,719

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













9.
Lines of Business, continued

 
Animal
Hospital
 
Laboratory
 
All Other
 
Corporate
 

Eliminations
 
Total
Six Months Ended
June 30, 2017
 
 
 
 
 
 
 
 
 
 
 
External revenue
$
1,196,979

 
$
185,818

 
$
36,864

 
$
—

 
$
1,722

 
$
1,421,383

Intercompany revenue
—

 
42,531

 
8,238

 
—

 
(50,769
)
 
—

Total revenue
1,196,979

 
228,349

 
45,102

 
—

 
(49,047
)
 
1,421,383

Direct costs
998,110

 
105,332

 
27,060

 
—

 
(48,680
)
 
1,081,822

Gross profit
198,869

 
123,017

 
18,042

 
—

 
(367
)
 
339,561

Selling, general and administrative expense
34,356

 
19,881

 
14,152

 
49,788

 
—

 
118,177

Operating income (loss) before sale or disposal of assets
164,513

 
103,136

 
3,890

 
(49,788
)
 
(367
)
 
221,384

Net loss on sale or disposal of assets
436

 
41

 
3

 
—

 
—

 
480

Operating income (loss)
$
164,077

 
$
103,095

 
$
3,887

 
$
(49,788
)
 
$
(367
)
 
$
220,904

Depreciation and amortization
$
53,144

 
$
6,081

 
$
1,678

 
$
1,407

 
$
(1,390
)
 
$
60,920

Property and equipment additions
$
39,568

 
$
12,682

 
$
1,477

 
$
2,880

 
$
(1,969
)
 
$
54,638

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

 
 
 
 
 
 
 
 
 
 
 
 
At June 30, 2017
 
 
 
 
 
 
 
 
 
 
 
Total assets
$
3,282,596

 
$
350,220

 
$
74,838

 
$
1,970,760

 
$
(2,140,689
)
 
$
3,537,725

At December 31, 2016
 
 
 
 
 
 
 
 
 
 
 
Total assets
$
3,137,177

 
$
331,484

 
$
74,752

 
$
1,502,150

 
$
(1,672,235
)
 
$
3,373,328