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Federal Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Schedule of Reconciliation of Federal Income Tax on Income at the Corporate Rate to the Effective Tax Rate |
($ in thousands) |  | 2017 |  | 2016 |  | 2015
Tax at statutory rate of 35% |  | $ | 91,689 |  |  | 76,984 |  |  | 81,442 |
Tax-advantaged interest |  | (11,510 | ) |  | (12,126 | ) |  | (13,164 | )
Dividends received deduction |  | (1,961 | ) |  | (1,114 | ) |  | (1,817 | )
Stock based compensation |  | (4,281 | ) |  | — |  |  | — |
Tax reform rate change |  | 20,205 |  |  | — |  |  | — |
Other |  | (1,000 | ) |  | (2,284 | ) |  | 370 |
Federal income tax expense from continuing operations |  | $ | 93,142 |  |  | 61,460 |  |  | 66,831 |
Schedule of Deferred Tax Assets and Liabilities |
($ in thousands) |  | 2017 |  | 2016
Deferred tax assets: |  |  |  |  |  |
Net loss reserve discounting |  | $ | 38,771 |  |  | 70,065 |
Net unearned premiums |  | 50,267 |  |  | 78,201 |
Employee benefits |  | 8,606 |  |  | 17,881 |
Long-term incentive compensation plans |  | 12,221 |  |  | 17,750 |
Temporary investment write-downs |  | 1,044 |  |  | 2,475 |
Other investment related items, net |  | — |  |  | 1,484 |
Net operating loss |  | 54 |  |  | 771 |
Other |  | 5,784 |  |  | 8,344 |
Total deferred tax assets |  | 116,747 |  |  | 196,971 |
Deferred tax liabilities: |  |  |  |  |  |
Deferred policy acquisition costs |  | 47,484 |  |  | 75,310 |
Unrealized gains on investment securities |  | 26,183 |  |  | 22,681 |
Other investment-related items, net |  | 2,500 |  |  | — |
Accelerated depreciation and amortization |  | 8,590 |  |  | 14,140 |
Total deferred tax liabilities |  | 84,757 |  |  | 112,131 |
Net deferred federal income tax asset |  | $ | 31,990 |  |  | 84,840 |

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- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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