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Schedule I - Summay of Investments - Other Than Investments in Related Parties
12 Months Ended
Dec. 31, 2016
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:
 
 

 
 

 
 

Obligations of states and political subdivisions
 
$
77,466

 
79,916

 
77,783

Public utilities
 
8,589

 
9,292

 
8,579

All other corporate securities
 
14,122

 
14,783

 
13,989

Commercial mortgage-backed securities
 
1,220

 
1,220

 
1,205

Total fixed income securities, held-to-maturity
 
101,397

 
105,211

 
101,556

 
 
 
 
 
 
 
Available-for-sale:
 
 

 
 

 
 

U.S. government and government agencies
 
75,139

 
77,333

 
77,333

Foreign government
 
26,559

 
26,865

 
26,865

Obligations of states and political subdivisions
 
1,366,287

 
1,379,593

 
1,379,593

Public utilities
 
108,664

 
110,000

 
110,000

All other corporate securities
 
1,867,892

 
1,887,753

 
1,887,753

Collateralized loan obligation securities and other asset-backed securities
 
527,876

 
528,960

 
528,960

Commercial mortgage-backed securities
 
256,356

 
256,842

 
256,842

Residential mortgage-backed securities
 
524,986

 
525,194

 
525,194

Total fixed income securities, available-for-sale
 
4,753,759

 
4,792,540

 
4,792,540

 
 
 
 
 
 
 
Equity securities:
 
 

 
 

 
 

Common stock:
 
 

 
 

 
 

Banks, trusts and insurance companies
 
14,056

 
17,648

 
17,648

Industrial, miscellaneous and all other
 
90,607

 
112,960

 
112,960

Total common stock, available-for-sale
 
104,663

 
130,608

 
130,608

 
 
 
 
 
 
 
Preferred stock:
 
 
 
 
 
 
Banks, trusts and insurance companies
 
16,226

 
16,145

 
16,145

Total preferred stock, available-for-sale
 
16,226

 
16,145

 
16,145

            Total equity securities, available-for-sale
 
120,889

 
146,753

 
146,753

Short-term investments
 
221,701

 
221,701

 
221,701

Other investments
 
102,397

 
 

 
102,397

Total investments
 
$
5,300,143

 
 

 
5,364,947


See accompanying Report of Independent Registered Public Accounting Firm in Item 8. "Financial Statements and Supplementary Data." of this Form 10-K.