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Reserve for Losses and Loss Expenses (Tables)
 12 Months Ended
Dec. 31, 2013
Insurance Loss Reserves [Abstract]  
Schedule of Roll Forward of Reserves for Losses and Loss Expenses
($ in thousands)
 
2013
 
2012
 
2011
Gross reserves for losses and loss expenses, at beginning of year
 
$
4,068,941

 
3,144,924

 
2,830,058

Less: reinsurance recoverable on unpaid losses and loss expenses, at beginning of year
 
1,409,755

 
549,490

 
313,739

Net reserves for losses and loss expenses, at beginning of year
 
2,659,186

 
2,595,434

 
2,516,319

Incurred losses and loss expenses for claims occurring in the:
 
 

 
 

 
 

Current year
 
1,147,263

 
1,146,591

 
1,113,733

Prior years
 
(25,525
)
 
(25,601
)
 
(38,746
)
Total incurred losses and loss expenses
 
1,121,738

 
1,120,990

 
1,074,987

Paid losses and loss expenses for claims occurring in the:
 
 

 
 

 
 

Current year
 
399,559

 
424,496

 
440,786

Prior years
 
572,434

 
632,742

 
569,944

Total paid losses and loss expenses
 
971,993

 
1,057,238

 
1,010,730

Acquisition of Mesa Underwriters Specialty Insurance Company ("MUSIC") losses and loss expense reserves
 
—

 
—

 
14,858

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

 
2,659,186

 
2,595,434

Add: Reinsurance recoverable on unpaid losses and loss expenses, at end of year1
 
540,839

 
1,409,755

 
549,490

Gross reserves for losses and loss expenses at end of year
 
$
3,349,770

 
4,068,941

 
3,144,924


 1 Includes $44.0 million related to the acquisition of MUSIC at December 31, 2011.
Schedule of Favorable/(Unfavorable) Prior Year Development
Favorable/(Unfavorable) Prior Year Development
 
 
 
 
 
 
($ in millions)
 
2013
 
2012
 
2011
General Liability
 
$
20.0

 
(2.5
)
 
11.5

Commercial Automobile
 
4.5

 
8.5

 
13.0

Workers Compensation
 
(23.5
)
 
(2.5
)
 
(6.5
)
Businessowners' Policies
 
9.5

 
9.0

 
11.0

Commercial Property
 
7.5

 
3.5

 
5.5

Homeowners
 
2.5

 
9.0

 
4.5

Personal Automobile
 
3.0

 
(0.5
)
 
(1.0
)
E&S
 
2.0

 
—

 
—

Other
 
—

 
1.0

 
0.5

Total
 
$
25.5

 
25.5

 
38.5
Schedule of Exposure to Various Asbestos and Environmental Claims
 
 
2013
($ in millions)
 
Gross
 
Net
Asbestos
 
$
8.9

 
7.5

Landfill sites
 
12.3

 
7.4

Leaking underground storage tanks
 
11.6

 
10.3

Total
 
$
32.8

 
25.2


 
Schedule of Roll Forward of Gross and Net Asbestos and Environmental Incurred Losses and Loss Expenses and Related Reserves
 
 
2013
 
2012
 
2011
($ in thousands)
 
Gross
 
Net
 
Gross
 
Net
 
Gross
 
Net
Asbestos
 
 

 
 

 
 

 
 

 
 

 
 

Reserves for losses and loss expenses at beginning of year
 
$
9,170

 
7,791

 
8,412

 
6,586

 
9,979

 
8,167

Incurred losses and loss expenses
 
—

 
—

 
1,696

 
2,000

 
2,014

 
2,000

Less: losses and loss expenses paid
 
(273
)
 
(273
)
 
(938
)
 
(795
)
 
(3,581
)
 
(3,581
)
Reserves for losses and loss expenses at the end of year
 
$
8,897

 
7,518

 
9,170

 
7,791

 
8,412

 
6,586

 
 
 
 
 
 
 
 
 
 
 
 
 
Environmental
 
 

 
 

 
 

 
 

 
 

 
 

Reserves for losses and loss expenses at beginning of year
 
$
26,405

 
19,978

 
27,600

 
21,330

 
33,630

 
27,599

Incurred losses and loss expenses
 
347

 
68

 
1,363

 
1,000

 
(4,285
)
 
(4,750
)
Less: losses and loss expenses paid
 
(2,885
)
 
(2,397
)
 
(2,558
)
 
(2,352
)
 
(1,745
)
 
(1,519
)
Reserves for losses and loss expenses at the end of year
 
$
23,867

 
17,649

 
26,405

 
19,978

 
27,600

 
21,330

 
 
 
 
 
 
 
 
 
 
 
 
 
Total Asbestos and Environmental Claims
 
 

 
 

 
 

 
 

 
 

 
 

Reserves for losses and loss expenses at beginning of year
 
$
35,575

 
27,769

 
36,012

 
27,916

 
43,609

 
35,766

Incurred losses and loss expenses
 
347

 
68

 
3,059

 
3,000

 
(2,271
)
 
(2,750
)
Less: losses and loss expenses paid
 
(3,158
)
 
(2,670
)
 
(3,496
)
 
(3,147
)
 
(5,326
)
 
(5,100
)
Reserves for losses and loss expenses at the end of year
 
$
32,764

 
25,167

 
35,575

 
27,769

 
36,012

 
27,916