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Federal Income Taxes | 12 Months Ended
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Dec. 31, 2015
Income Tax Disclosure [Abstract] |
Federal Income Taxes | Federal Income Taxes (a) A reconciliation of federal income tax on income at the corporate rate to the effective tax rate is as follows:
($ in thousands) |  | 2015 |  | 2014 |  | 2013
Tax at statutory rate of 35% |  | $ | 81,442 |  |  | 68,996 |  |  | 50,331 |
Tax-advantaged interest |  | (13,164 | ) |  | (12,926 | ) |  | (12,718 | )
Dividends received deduction |  | (1,817 | ) |  | (1,121 | ) |  | (1,174 | )
Other |  | 370 |  |  | 355 |  |  | (52 | )
Federal income tax expense from continuing operations |  | $ | 66,831 |  |  | 55,304 |  |  | 36,387 |
(b) The tax effects of the significant temporary differences that give rise to deferred tax assets and liabilities are as follows:
($ in thousands) |  | 2015 |  | 2014
Deferred tax assets: |  |  |  |  |  |
Net loss reserve discounting |  | $ | 74,436 |  |  | 84,502 |
Net unearned premiums |  | 72,057 |  |  | 66,470 |
Employee benefits |  | 30,432 |  |  | 33,721 |
Long-term incentive compensation plans |  | 15,551 |  |  | 13,625 |
Temporary investment write-downs |  | 5,419 |  |  | 3,939 |
Net operating loss |  | 1,454 |  |  | 2,136 |
Alternative minimum tax credits |  | — |  |  | 7,400 |
Other |  | 8,132 |  |  | 9,237 |
Total deferred tax assets |  | 207,481 |  |  | 221,030 |
Deferred tax liabilities: |  |  |  |  |  |
Deferred policy acquisition costs |  | 72,481 |  |  | 63,242 |
Unrealized gains on investment securities |  | 24,228 |  |  | 43,289 |
Other investment-related items, net |  | 5,566 |  |  | 5,088 |
Accelerated depreciation and amortization |  | 12,510 |  |  | 10,962 |
Total deferred tax liabilities |  | 114,785 |  |  | 122,581 |
Net deferred federal income tax asset |  | $ | 92,696 |  |  | 98,449 |
After considering all evidence, both positive and negative, with respect to our federal tax loss carryback availability, expected levels of pre-tax financial statement income, and federal taxable income, we believe it is more likely than not that the existing deductible temporary differences will reverse during periods in which we generate net federal taxable income or have adequate federal carryback availability. As a result, we have no valuation allowance recognized for federal deferred tax assets at December 31, 2015 or 2014. As of December 31, 2015, we had federal tax NOL carryforwards of $4.2 million. These NOLs, which are subject to an annual limitation of $1.9 million, will expire between 2029 and 2031 as follows:
($ in thousands) |  | Gross NOL |  | Tax Effected NOL
2029 |  | $ | 75 |  |  | 26 |
2030 |  | 3,999 |  |  | 1,400 |
2031 |  | 79 |  |  | 28 |
Total NOL carryforwards |  | $ | 4,153 |  |  | 1,454 |
Stockholders' equity reflects tax benefits related to compensation expense deductions for share-based compensation awards of $22.0 million at December 31, 2015, $20.2 million at December 31, 2014, and $19.2 million at December 31, 2013. We have analyzed our tax positions in all open tax years, which as of December 31, 2015 were 2012 through 2014. The 2013 tax year is currently under audit. We do not have unrecognized tax expense or benefit as of December 31, 2015. We believe our tax positions will more likely than not be sustained upon examination, including related appeals or litigation. In the event we had a tax position that did not meet the more likely than not criteria, any tax, interest, and penalties incurred related to such a position would be reflected in "Total federal income tax expense" on our Consolidated Statements of Income.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319 Reference 5: 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=6907707&loc=d3e32537-109319 + Details
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