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Reserve for Losses and Loss Expenses (Tables)
 12 Months Ended
Dec. 31, 2014
Insurance Loss Reserves [Abstract]  
Schedule of Roll Forward of Reserves for Losses and Loss Expenses
($ in thousands)
 
2014
 
2013
 
2012
Gross reserves for losses and loss expenses, at beginning of year
 
$
3,349,770

 
4,068,941

 
3,144,924

Less: reinsurance recoverable on unpaid losses and loss expenses, at beginning of year
 
540,839

 
1,409,755

 
549,490

Net reserves for losses and loss expenses, at beginning of year
 
2,808,931

 
2,659,186

 
2,595,434

Incurred losses and loss expenses for claims occurring in the:
 
 

 
 

 
 

Current year
 
1,216,770

 
1,147,263

 
1,146,591

Prior years
 
(59,269
)
 
(25,525
)
 
(25,601
)
Total incurred losses and loss expenses
 
1,157,501

 
1,121,738

 
1,120,990

Paid losses and loss expenses for claims occurring in the:
 
 

 
 

 
 

Current year
 
468,478

 
399,559

 
424,496

Prior years
 
592,062

 
572,434

 
632,742

Total paid losses and loss expenses
 
1,060,540

 
971,993

 
1,057,238

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

 
2,808,931

 
2,659,186

Add: Reinsurance recoverable on unpaid losses and loss expenses, at end of year
 
571,978

 
540,839

 
1,409,755

Gross reserves for losses and loss expenses at end of year
 
$
3,477,870

 
3,349,770

 
4,068,941
Schedule of(Favorable)/ Unfavorable Prior Year Development
(Favorable)/Unfavorable Prior Year Development
 
 
 
 
 
 
($ in millions)
 
2014
 
2013
 
2012
General Liability
 
$
(43.9
)
 
(20.0
)
 
2.5

Commercial Automobile
 
(4.1
)
 
(4.5
)
 
(8.5
)
Workers Compensation
 
—

 
23.5

 
2.5

Businessowners' Policies
 
1.9

 
(9.5
)
 
(9.0
)
Commercial Property
 
(2.1
)
 
(7.5
)
 
(3.5
)
Homeowners
 
(4.0
)
 
(2.5
)
 
(9.0
)
Personal Automobile
 
(10.8
)
 
(3.0
)
 
0.5

E&S
 
3.7

 
(2.0
)
 
—

Other
 
—

 
—

 
(1.0
)
Total
 
$
(59.3
)
 
(25.5
)
 
(25.5
)
Schedule of Exposure to Various Asbestos and Environmental Claims
 
 
2014
($ in millions)
 
Gross
 
Net
Asbestos
 
$
8.8

 
7.3

Landfill sites
 
11.5

 
6.6

Leaking underground storage tanks
 
10.4

 
9.1

Total
 
$
30.7

 
23.0


 
Schedule of Roll Forward of Gross and Net Asbestos and Environmental Incurred Losses and Loss Expenses and Related Reserves
 
 
2014
 
2013
 
2012
($ in thousands)
 
Gross
 
Net
 
Gross
 
Net
 
Gross
 
Net
Asbestos
 
 

 
 

 
 

 
 

 
 

 
 

Reserves for losses and loss expenses at beginning of year
 
$
8,897

 
7,518

 
9,170

 
7,791

 
8,412

 
6,586

Incurred losses and loss expenses
 
60

 
—

 
—

 
—

 
1,696

 
2,000

Less: losses and loss expenses paid
 
(206
)
 
(204
)
 
(273
)
 
(273
)
 
(938
)
 
(795
)
Reserves for losses and loss expenses at the end of year
 
$
8,751

 
7,314

 
8,897

 
7,518

 
9,170

 
7,791

 
 
 
 
 
 
 
 
 
 
 
 
 
Environmental
 
 

 
 

 
 

 
 

 
 

 
 

Reserves for losses and loss expenses at beginning of year
 
$
23,867

 
17,649

 
26,405

 
19,978

 
27,600

 
21,330

Incurred losses and loss expenses
 
107

 
—

 
347

 
68

 
1,363

 
1,000

Less: losses and loss expenses paid
 
(2,072
)
 
(1,969
)
 
(2,885
)
 
(2,397
)
 
(2,558
)
 
(2,352
)
Reserves for losses and loss expenses at the end of year
 
$
21,902

 
15,680

 
23,867

 
17,649

 
26,405

 
19,978

 
 
 
 
 
 
 
 
 
 
 
 
 
Total Asbestos and Environmental Claims
 
 

 
 

 
 

 
 

 
 

 
 

Reserves for losses and loss expenses at beginning of year
 
$
32,764

 
25,167

 
35,575

 
27,769

 
36,012

 
27,916

Incurred losses and loss expenses
 
167

 
—

 
347

 
68

 
3,059

 
3,000

Less: losses and loss expenses paid
 
(2,278
)
 
(2,173
)
 
(3,158
)
 
(2,670
)
 
(3,496
)
 
(3,147
)
Reserves for losses and loss expenses at the end of year
 
$
30,653

 
22,994

 
32,764

 
25,167

 
35,575

 
27,769