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Schedule III - Supplementary Insurance Information
 12 Months Ended
Dec. 31, 2017
Supplementary Insurance Information [Abstract]  
Schedule III - Supplementary Insurance Information
 
2017
2016
2015
Net premiums earned
 
 
 
Specialty P&C
$
453,921

$
457,816

$
443,313

Workers' Compensation
227,408

220,815

213,161

Lloyd's Syndicate
57,202

54,650

37,675

Consolidated
$
738,531

$
733,281

$
694,149

Net investment income (1)
 
 
 
Lloyd's Syndicate
$
1,736

$
1,410

$
928

Corporate
93,926

98,602

107,732

Consolidated
$
95,662

$
100,012

$
108,660

Losses and loss adjustment expenses incurred related to current year, net of reinsurance
 
 
 
Specialty P&C
$
407,994

$
405,738

$
409,149

Workers' Compensation
150,492

146,654

142,943

Lloyd's Syndicate
45,032

34,615

25,181

Inter-segment eliminations
—

—

(5,382
)
Consolidated
$
603,518

$
587,007

$
571,891

Losses and loss adjustment expenses incurred related to prior year, net of reinsurance
 
 
 
Specialty P&C
$
(119,293
)
$
(137,159
)
$
(158,981
)
Workers' Compensation
(14,255
)
(6,120
)
(2,199
)
Lloyd's Syndicate
(812
)
(499
)
—

Consolidated
$
(134,360
)
$
(143,778
)
$
(161,180
)
Paid losses and loss adjustment expenses, net of reinsurance
 
 
 
Specialty P&C
$
324,347

$
343,678

$
346,606

Workers' Compensation
122,042

114,320

126,296

Lloyd's Syndicate
29,926

21,254

7,549

Inter-segment eliminations
—

—

(5,416
)
Consolidated
$
476,315

$
479,252

$
475,035

Amortization of DPAC
 
 
 
Specialty P&C
$
48,469

$
45,019

$
45,459

Workers' Compensation
32,088

29,590

26,232

Lloyd's Syndicate
15,194

13,769

7,841

Inter-segment eliminations
—

—

24

Consolidated
$
95,751

$
88,378

$
79,556

Other underwriting, policy acquisition and operating expenses
 
 
 
Specialty P&C
$
60,361

$
59,314

$
60,115

Workers' Compensation
38,857

40,874

37,421

Lloyd's Syndicate
11,769

9,063

10,677

Corporate
29,275

30,807

24,518

Inter-segment eliminations
(260
)
(826
)
4,777

Consolidated
$
140,002

$
139,232

$
137,508

Net premiums written
 
 
 
Specialty P&C
$
470,535

$
458,681

$
442,126

Workers' Compensation
238,514

223,578

218,338

Lloyd's Syndicate
54,969

56,274

48,821

Consolidated
$
764,018

$
738,533

$
709,285

Deferred policy acquisition costs (1)
$
50,261

$
46,809

$
44,388

Reserve for losses and loss adjustment expenses (1)
$
2,048,381

$
1,993,428

$
2,005,326

Unearned premiums (1)
$
398,884

$
372,563

$
362,066


(1) Assets are not allocated to segments because investments and assets are not managed at the segment level.