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Schedule I - Summay of Investments - Other Than Investments in Related Parties
12 Months Ended
Dec. 31, 2014
Summary of Investments, Other than Investments in Related Parties [Abstract]  
Schedule I - Summary of Investments- Other than Investments in Related Parties
Types of investment
 
 
 
 
 
 
($ in thousands)
 
Amortized Cost or Cost
 
Fair Value
 
Carrying Amount
Fixed income securities:
 
 

 
 

 
 

Held-to-maturity:
 
 

 
 

 
 

Foreign government obligations
 
$
5,292

 
5,394

 
5,339

Obligations of states and political subdivisions
 
285,301

 
299,132

 
287,372

Public utilities
 
11,019

 
12,483

 
11,000

All other corporate securities
 
7,880

 
8,939

 
7,626

Asset-backed securities
 
2,818

 
2,823

 
2,363

Commercial mortgage-backed securities
 
4,869

 
5,190

 
4,437

Total fixed income securities, held-to-maturity
 
317,179

 
333,961

 
318,137

 
 
 
 
 
 
 
Available-for-sale:
 
 

 
 

 
 

U.S. government and government agencies
 
116,666

 
124,130

 
124,130

Foreign government obligations
 
27,035

 
27,831

 
27,831

Obligations of states and political subdivisions
 
1,208,776

 
1,246,264

 
1,246,264

Public utilities
 
149,006

 
150,977

 
150,977

All other corporate securities
 
1,614,421

 
1,648,829

 
1,648,829

Asset-backed securities
 
176,837

 
177,224

 
177,224

Commercial mortgage-backed securities
 
177,932

 
179,593

 
179,593

Residential mortgage-backed securities
 
505,113

 
511,274

 
511,274

Total fixed income securities, available-for-sale
 
3,975,786

 
4,066,122

 
4,066,122

 
 
 
 
 
 
 
Equity securities:
 
 

 
 

 
 

Common stock:
 
 

 
 

 
 

Public utilities
 
8,815

 
10,284

 
10,284

Banks, trust and insurance companies
 
30,187

 
35,348

 
35,348

Industrial, miscellaneous and all other
 
120,009

 
145,768

 
145,768

Total equity securities, available-for-sale
 
159,011

 
191,400

 
191,400

Short-term investments
 
131,972

 
131,972

 
131,972

Other investments
 
99,203

 
 

 
99,203

Total investments
 
$
4,683,151

 
 

 
4,806,834