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Reserve for Losses and Loss Expenses (Tables)
 12 Months Ended
Dec. 31, 2015
Insurance Loss Reserves [Abstract]  
Schedule of Roll Forward of Reserves for Losses and Loss Expenses
($ in thousands)
 
2015
 
2014
 
2013
Gross reserves for losses and loss expenses, at beginning of year
 
$
3,477,870

 
3,349,770

 
4,068,941

Less: reinsurance recoverable on unpaid losses and loss expenses, at beginning of year
 
571,978

 
540,839

 
1,409,755

Net reserves for losses and loss expenses, at beginning of year
 
2,905,892

 
2,808,931

 
2,659,186

Incurred losses and loss expenses for claims occurring in the:
 
 

 
 

 
 

Current year
 
1,217,550

 
1,216,770

 
1,147,263

Prior years
 
(69,009
)
 
(59,269
)
 
(25,525
)
Total incurred losses and loss expenses
 
1,148,541

 
1,157,501

 
1,121,738

Paid losses and loss expenses for claims occurring in the:
 
 

 
 

 
 

Current year
 
446,550

 
468,478

 
399,559

Prior years
 
641,174

 
592,062

 
572,434

Total paid losses and loss expenses
 
1,087,724

 
1,060,540

 
971,993

Net reserves for losses and loss expenses, at end of year
 
2,966,709

 
2,905,892

 
2,808,931

Add: Reinsurance recoverable on unpaid losses and loss expenses, at end of year
 
551,019

 
571,978

 
540,839

Gross reserves for losses and loss expenses at end of year
 
$
3,517,728

 
3,477,870

 
3,349,770
Schedule of(Favorable)/ Unfavorable Prior Year Development
(Favorable)/Unfavorable Prior Year Development
 
 
 
 
 
 
($ in millions)
 
2015
 
2014
 
2013
General Liability
 
$
(51.0
)
 
(43.9
)
 
(20.0
)
Commercial Automobile
 
2.4

 
(4.1
)
 
(4.5
)
Workers Compensation
 
(37.0
)
 
—

 
23.5

Businessowners' Policies
 
2.2

 
1.9

 
(9.5
)
Commercial Property
 
(3.0
)
 
(2.1
)
 
(7.5
)
Homeowners
 
1.5

 
(4.0
)
 
(2.5
)
Personal Automobile
 
0.4

 
(10.8
)
 
(3.0
)
E&S
 
15.5

 
3.7

 
(2.0
)
Total
 
$
(69.0
)
 
(59.3
)
 
(25.5
)
Schedule of Exposure to Various Asbestos and Environmental Claims
 
 
2015
($ in millions)
 
Gross
 
Net
Asbestos
 
$
8.0

 
6.8

Landfill sites
 
13.1

 
8.3

Leaking underground storage tanks
 
9.3

 
8.1

Total
 
$
30.4

 
23.2


 
Schedule of Roll Forward of Gross and Net Asbestos and Environmental Incurred Losses and Loss Expenses and Related Reserves
 
 
2015
 
2014
 
2013
($ in thousands)
 
Gross
 
Net
 
Gross
 
Net
 
Gross
 
Net
Asbestos
 
 

 
 

 
 

 
 

 
 

 
 

Reserves for losses and loss expenses at beginning of year
 
$
8,751

 
7,314

 
8,897

 
7,518

 
9,170

 
7,791

Incurred losses and loss expenses
 
(428
)
 
(77
)
 
60

 
—

 
—

 
—

Less: losses and loss expenses paid
 
(299
)
 
(444
)
 
(206
)
 
(204
)
 
(273
)
 
(273
)
Reserves for losses and loss expenses at the end of year
 
$
8,024

 
6,793

 
8,751

 
7,314

 
8,897

 
7,518

 
 
 
 
 
 
 
 
 
 
 
 
 
Environmental
 
 

 
 

 
 

 
 

 
 

 
 

Reserves for losses and loss expenses at beginning of year
 
$
21,902

 
15,680

 
23,867

 
17,649

 
26,405

 
19,978

Incurred losses and loss expenses
 
3,396

 
3,397

 
107

 
—

 
347

 
68

Less: losses and loss expenses paid
 
(2,911
)
 
(2,709
)
 
(2,072
)
 
(1,969
)
 
(2,885
)
 
(2,397
)
Reserves for losses and loss expenses at the end of year
 
$
22,387

 
16,368

 
21,902

 
15,680

 
23,867

 
17,649

 
 
 
 
 
 
 
 
 
 
 
 
 
Total Asbestos and Environmental Claims
 
 

 
 

 
 

 
 

 
 

 
 

Reserves for losses and loss expenses at beginning of year
 
$
30,653

 
22,994

 
32,764

 
25,167

 
35,575

 
27,769

Incurred losses and loss expenses
 
2,968

 
3,320

 
167

 
—

 
347

 
68

Less: losses and loss expenses paid
 
(3,210
)
 
(3,153
)
 
(2,278
)
 
(2,173
)
 
(3,158
)
 
(2,670
)
Reserves for losses and loss expenses at the end of year
 
$
30,411

 
23,161

 
30,653

 
22,994

 
32,764

 
25,167