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Lines of Business (Tables)
 9 Months Ended
Sep. 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
September 30, 2016
 
 
 
 
 
 
 
 
 
 
 
External revenue
$
553,378

 
$
84,970

 
$
17,450

 
$
—

 
$
1,056

 
$
656,854

Intercompany revenue
—

 
20,170

 
5,537

 
—

 
(25,707
)
 
—

Total revenue
553,378

 
105,140

 
22,987

 
—

 
(24,651
)
 
656,854

Direct costs
459,242

 
50,934

 
14,066

 
—

 
(23,965
)
 
500,277

Gross profit
94,136

 
54,206

 
8,921

 
—

 
(686
)
 
156,577

Selling, general and administrative expense
15,541

 
9,728

 
6,064

 
18,010

 
—

 
49,343

Operating income (loss) before sale or disposal of assets
78,595

 
44,478

 
2,857

 
(18,010
)
 
(686
)
 
107,234

Net loss (gain) on sale or disposal of assets
304

 
1

 
1

 
(70
)
 
—

 
236

Operating income (loss)
$
78,291

 
$
44,477

 
$
2,856

 
$
(17,940
)
 
$
(686
)
 
$
106,998

Depreciation and amortization
$
23,363

 
$
2,826

 
$
848

 
$
679

 
$
(622
)
 
$
27,094

Property and equipment additions
$
24,917

 
$
4,953

 
$
383

 
$
2,794

 
$
(1,315
)
 
$
31,732

Three Months Ended
September 30, 2015
 
 
 
 
 
 
 
 
 
 
 
External revenue
$
441,924

 
$
84,129

 
$
24,544

 
$
—

 
$
1,120

 
$
551,717

Intercompany revenue
—

 
16,180

 
6,294

 
—

 
(22,474
)
 
—

Total revenue
441,924

 
100,309

 
30,838

 
—

 
(21,354
)
 
551,717

Direct costs
366,983

 
48,901

 
19,077

 
—

 
(20,910
)
 
414,051

Gross profit
74,941

 
51,408

 
11,761

 
—

 
(444
)
 
137,666

Selling, general and administrative expense
10,677

 
9,542

 
7,660

 
16,981

 
—

 
44,860

Operating income (loss) before charges
64,264

 
41,866

 
4,101

 
(16,981
)
 
(444
)
 
92,806

Business interruption insurance gain
—

 
—

 
(4,523
)
 
—

 
—

 
(4,523
)
Net loss on sale or disposal of assets
175

 
—

 
72

 
3

 
—

 
250

Operating income (loss)
$
64,089


$
41,866

 
$
8,552

 
$
(16,984
)
 
$
(444
)
 
$
97,079

Depreciation and amortization
$
16,520

 
$
2,731

 
$
1,181

 
$
588

 
$
(549
)
 
$
20,471

Property and equipment additions
$
19,429

 
$
5,735

 
$
127

 
$
2,773

 
$
(1,115
)
 
$
26,949












10.
Lines of Business, continued

 
Animal
Hospital
 
Laboratory
 
All Other
 
Corporate
 

Eliminations
 
Total
Nine Months Ended
September 30, 2016
 
 
 
 
 
 
 
 
 
 
 
External revenue
$
1,552,377

 
$
267,475

 
$
50,560

 
$
—

 
$
3,370

 
$
1,873,782

Intercompany revenue
—

 
56,452

 
15,237

 
—

 
(71,689
)
 
—

Total revenue
1,552,377

 
323,927

 
65,797

 
—

 
(68,319
)
 
1,873,782

Direct costs
1,290,145

 
152,458

 
41,049

 
—

 
(67,175
)
 
1,416,477

Gross profit
262,232

 
171,469

 
24,748

 
—

 
(1,144
)
 
457,305

Selling, general and administrative expense
41,903

 
29,726

 
17,385

 
58,647

 
—

 
147,661

Operating income (loss) before sale or disposal of assets
220,329

 
141,743

 
7,363

 
(58,647
)
 
(1,144
)
 
309,644

Net loss (gain) on sale or disposal of assets
747

 
(34
)
 
4

 
(189
)
 
—

 
528

Operating income (loss)
$
219,582

 
$
141,777

 
$
7,359

 
$
(58,458
)
 
$
(1,144
)
 
$
309,116

Depreciation and amortization
$
62,811

 
$
8,446

 
$
2,635

 
$
1,985

 
$
(1,805
)
 
$
74,072

Property and equipment additions
$
68,947

 
$
14,355

 
$
2,475

 
$
7,981

 
$
(3,212
)
 
$
90,546

Nine Months Ended
September 30, 2015
 
 
 
 
 
 
 
 
 
 
 
External revenue
$
1,270,326

 
$
252,645

 
$
73,895

 
$
—

 
$
3,089

 
$
1,599,955

Intercompany revenue
—

 
47,858

 
19,839

 
—

 
(67,697
)
 
—

Total revenue
1,270,326

 
300,503

 
93,734

 
—

 
(64,608
)
 
1,599,955

Direct costs
1,066,516

 
144,410

 
59,160

 
—

 
(62,506
)
 
1,207,580

Gross profit
203,810

 
156,093

 
34,574

 
—

 
(2,102
)
 
392,375

Selling, general and administrative expense
32,351

 
27,894

 
24,088

 
49,410

 
—

 
133,743

Operating income (loss) before charges
171,459

 
128,199

 
10,486

 
(49,410
)
 
(2,102
)
 
258,632

Business interruption insurance gain
—

 
—

 
(4,523
)
 
—

 
—

 
(4,523
)
Net (gain) loss on sale or disposal of assets
(445
)
 
41

 
92

 
78

 
—

 
(234
)
Operating income (loss)
$
171,904

 
$
128,158

 
$
14,917

 
$
(49,488
)
 
$
(2,102
)
 
$
263,389

Depreciation and amortization
$
49,032

 
$
7,940

 
$
3,509

 
$
1,755

 
$
(1,602
)
 
$
60,634

Property and equipment additions
$
45,506

 
$
11,813

 
$
1,427

 
$
5,349

 
$
(2,625
)
 
$
61,470

 
 
 
 
 
 
 
 
 
 
 
 
At September 30, 2016
 
 
 
 
 
 
 
 
 
 
 
Total assets
$
2,961,074

 
$
329,694

 
$
70,923

 
$
1,349,186

 
$
(1,501,815
)
 
$
3,209,062

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

 
$
306,296

 
$
73,491

 
$
471,112

 
$
(536,726
)
 
$
2,501,132