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Reinsurance (Tables) | 6 Months Ended
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Jun. 30, 2018
Insurance [Abstract] |
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
Three months ended June 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |
Premiums written and contract deposits (1) |  | $ | 305,864 |  |  | $ | 5,483 |  |  | $ | 1,341 |  |  | $ | 301,722 |
Premiums and contract charges earned |  | 209,892 |  |  | 5,505 |  |  | 1,223 |  |  | 205,610 |
Benefits, claims and settlement expenses |  | 170,459 |  |  | 3,330 |  |  | 1,149 |  |  | 168,278 |
Three months ended June 30, 2017 |  |  |  |  |  |  |  |  |  |  |  |
Premiums written and contract deposits (1) |  | $ | 316,123 |  |  | $ | 5,643 |  |  | $ | 1,134 |  |  | $ | 311,614 |
Premiums and contract charges earned |  | 200,351 |  |  | 5,665 |  |  | 1,032 |  |  | 195,718 |
Benefits, claims and settlement expenses |  | 168,218 |  |  | 3,185 |  |  | 846 |  |  | 165,879 |
Six months ended June 30, 2018 |  |  |  |  |  |  |  |
Premiums written and contract deposits (1) |  | $ | 594,680 |  |  | $ | 10,997 |  |  | $ | 2,047 |  |  | $ | 585,730 |
Premiums and contract charges earned |  | 417,629 |  |  | 11,033 |  |  | 2,012 |  |  | 408,608 |
Benefits, claims and settlement expenses |  | 322,427 |  |  | 12,344 |  |  | 1,757 |  |  | 311,840 |
Six months ended June 30, 2017 |  |  |  |  |  |  |  |
Premiums written and contract deposits (1) |  | $ | 617,635 |  |  | $ | 11,153 |  |  | $ | 1,864 |  |  | $ | 608,346 |
Premiums and contract charges earned |  | 400,806 |  |  | 11,199 |  |  | 1,833 |  |  | 391,440 |
Benefits, claims and settlement expenses |  | 315,489 |  |  | 7,068 |  |  | 1,554 |  |  | 309,975 |
________________ (1) This measure is not based on accounting principles generally accepted in the United States of America (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 Tabular disclosure of the effects of reinsurance, for example, but not limited to, disclosure of direct, assumed, and ceded insurance. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
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Period Type: | duration