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Schedule I - Summay of Investments - Other Than Investments in Related Parties | 12 Months Ended
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Dec. 31, 2017
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 |  | $ | 25,154 |  |  | 26,261 |  |  | 25,238 |
Public utilities |  | 7,466 |  |  | 7,956 |  |  | 7,443 |
All other corporate securities |  | 9,530 |  |  | 9,883 |  |  | 9,448 |
Total fixed income securities, held-to-maturity |  | 42,150 |  |  | 44,100 |  |  | 42,129 |
Available-for-sale: |  |  |  |  |  |  |  |  |
U.S. government and government agencies |  | 49,326 |  |  | 49,740 |  |  | 49,740 |
Foreign government |  | 18,040 |  |  | 18,555 |  |  | 18,555 |
Obligations of states and political subdivisions |  | 1,539,307 |  |  | 1,582,970 |  |  | 1,582,970 |
Public utilities |  | 50,071 |  |  | 51,035 |  |  | 51,035 |
All other corporate securities |  | 1,538,268 |  |  | 1,566,433 |  |  | 1,566,433 |
Collateralized loan obligation securities and other asset-backed securities |  | 789,152 |  |  | 795,458 |  |  | 795,458 |
Commercial mortgage-backed securities |  | 382,727 |  |  | 383,449 |  |  | 383,449 |
Residential mortgage-backed securities |  | 709,825 |  |  | 714,882 |  |  | 714,882 |
Total fixed income securities, available-for-sale |  | 5,076,716 |  |  | 5,162,522 |  |  | 5,162,522 |
Equity securities: |  |  |  |  |  |  |  |  |
Common stock: |  |  |  |  |  |  |  |  |
Public utilities |  | 5,957 |  |  | 6,156 |  |  | 6,156 |
Banks, trusts and insurance companies |  | 34,301 |  |  | 40,510 |  |  | 40,510 |
Industrial, miscellaneous and all other |  | 89,438 |  |  | 121,091 |  |  | 121,091 |
Total common stock, available-for-sale |  | 129,696 |  |  | 167,757 |  |  | 167,757 |
Preferred stock: |  |  |  |  |  |
Banks, trusts and insurance companies |  | 14,115 |  |  | 14,948 |  |  | 14,948 |
Total preferred stock, available-for-sale |  | 14,115 |  |  | 14,948 |  |  | 14,948 |
Total equity securities, available-for-sale |  | 143,811 |  |  | 182,705 |  |  | 182,705 |
Short-term investments |  | 165,555 |  |  | 165,555 |  |  | 165,555 |
Other investments |  | 132,268 |  |  |  |  |  | 132,268 |
Total investments |  | $ | 5,560,500 |  |  |  |  |  | 5,685,179 |
See accompanying Report of Independent Registered Public Accounting Firm in Item 8. "Financial Statements and Supplementary Data." of this Form 10-K.

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- Definition The entire disclosure for the schedule applicable to insurance companies summarizing investments held as of the most recent audited balance sheet. At a minimum, such summary is by three major categories of investments including: (1) fixed maturities primarily consisting of bonds, including convertibles and bonds with warrants, and redeemable preferred stocks, (2) equity securities primarily consisting of common stocks and nonredeemable preferred stocks, and (3) other investments including mortgage loans on real estate, real estate held for investment, real estate acquired in satisfaction of debt, policy loans, other long-term investments, and short-term investments not otherwise categorized. The information provided with respect to each item within each category includes: (A) the original cost of equity securities and, as to fixed maturity securities, original cost reduced by repayments and adjusted for amortization of premiums or accrual of discounts, (B) fair value as of the reporting date, and (C) the amount at which the item within each category is shown in the statement of financial position; with respect to (C), if the amount at which shown in the statement of financial position is different from the items original [amortized] cost or fair value, an explanation of the difference may be included herein. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 320 -URI http://asc.fasb.org/subtopic&trid=4738149 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 325 -URI http://asc.fasb.org/subtopic&trid=4738175 + Details
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