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Deferred Policy Acquisition Costs, Deferred Sales Inducements and Lifetime Income Benefit Rider Reserves (Tables) | 12 Months Ended
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Dec. 31, 2017
Insurance [Abstract] |
Deferred Policy Acquisition Costs | Policy acquisition costs deferred and amortized are as follows:
| December 31,
| 2017 |  | 2016 |  | 2015
| (Dollars in thousands)
Balance at beginning of year | $ | 2,905,377 |  |  | $ | 2,905,136 |  |  | $ | 2,058,556 |
Costs deferred during the year: |  |  |  |  |
Commissions | 401,124 |  |  | 538,863 |  |  | 651,094 |
Policy issue costs | 5,517 |  |  | 4,462 |  |  | 6,545 |
Amortization | (255,964 | ) |  | (374,012 | ) |  | (286,114 | )
Effect of net unrealized gains/losses | (341,531 | ) |  | (169,072 | ) |  | 475,055 |
Balance at end of year | $ | 2,714,523 |  |  | $ | 2,905,377 |  |  | $ | 2,905,136 |
Deferred Sales Inducements | Sales inducements deferred and amortized are as follows:
| December 31,
| 2017 |  | 2016 |  | 2015
| (Dollars in thousands)
Balance at beginning of year | $ | 2,208,218 |  |  | $ | 2,232,148 |  |  | $ | 1,587,257 |
Costs deferred during the year | 216,172 |  |  | 353,966 |  |  | 486,924 |
Amortization | (176,612 | ) |  | (251,166 | ) |  | (209,390 | )
Effect of net unrealized gains/losses | (245,886 | ) |  | (126,730 | ) |  | 367,357 |
Balance at end of year | $ | 2,001,892 |  |  | $ | 2,208,218 |  |  | $ | 2,232,148 |

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- Definition Tabular disclosure of the movement in deferred policy acquisition costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=35755530&loc=d3e11264-158415 + Details
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- Definition Tabular disclosure of the change in deferred sales inducements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6481800&loc=d3e11332-158416 + Details
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