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Reinsurance and Catastrophes (Tables) | 12 Months Ended
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Dec. 31, 2017
Insurance [Abstract] |
Summary of reinsurance recoverable on unpaid insurance reserves | The total amounts of reinsurance recoverable on unpaid insurance reserves classified as assets and reported in Other assets in the Consolidated Balance Sheets were as follows:
($ in thousands) |  | December 31,
|  | 2017 |  | 2016
Reinsurance recoverables on reserves and unpaid claims |  |  |  |  |  |
Property and Casualty |  |  |  |  |  |
Reinsurance companies |  | $ | 6,696 |  |  | $ | 10,239 |
State insurance facilities |  | 50,713 |  |  | 50,960 |
Life and health |  | 11,037 |  |  | 9,275 |
Total |  | $ | 68,446 |  |  | $ | 70,474 |
Effects of reinsurance on premiums and benefits | The effects of reinsurance on premiums written and contract deposits; premiums and contract charges earned; and benefits, claims and settlement expenses were as follows:
($ in thousands) |  | Gross Amount |  | Ceded to Other Companies |  | Assumed from Other Companies |  | Net Amount
Year Ended December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |
Premiums written and contract deposits (1) |  | $ | 1,244,500 |  |  | $ | 21,989 |  |  | $ | 4,606 |  |  | $ | 1,227,117 |
Premiums and contract charges earned |  | 812,099 |  |  | 22,036 |  |  | 4,640 |  |  | 794,703 |
Benefits, claims and settlement expenses |  | 588,621 |  |  | 10,472 |  |  | 4,157 |  |  | 582,306 |
Year Ended December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |
Premiums written and contract deposits |  | 1,280,903 |  |  | 22,728 |  |  | 4,324 |  |  | 1,262,499 |
Premiums and contract charges earned |  | 777,651 |  |  | 22,826 |  |  | 4,321 |  |  | 759,146 |
Benefits, claims and settlement expenses |  | 562,385 |  |  | 25,739 |  |  | 4,358 |  |  | 541,004 |
Year Ended December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |
Premiums written and contract deposits |  | 1,277,066 |  |  | 24,737 |  |  | 4,184 |  |  | 1,256,513 |
Premiums and contract charges earned |  | 752,798 |  |  | 25,077 |  |  | 4,159 |  |  | 731,880 |
Benefits, claims and settlement expenses |  | 508,904 |  |  | 16,221 |  |  | 3,681 |  |  | 496,364 |
____________________ (1) This measure is not based on accounting principles generally accepted in the U.S. (non-GAAP). An explanation of this non-GAAP measure is contained in the Glossary of Selected Terms included as an exhibit in the Company's reports filed with the SEC.

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- Definition Schedule of reinsurance recoverable on reserves. + References No definition available. + Details
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- Definition Tabular disclosure of the effects of reinsurance, for example, but not limited to, disclosure of direct, assumed, and ceded insurance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 605 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6486672&loc=d3e27261-158547 + Details
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- References No definition available. + Details
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