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Federal Income Taxes
 6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]  
Income Tax Disclosure
Federal Income Taxes
(a) On December 22, 2017, Tax Reform was signed into law, which among other implications, reduced our statutory corporate tax rate from 35% to 21% beginning with our 2018 tax year.

We continue to provide provisional amounts for loss reserve discounting because the Internal Revenue Service ("IRS") has not yet issued guidance with regard to the discount rates to be used under Tax Reform. For additional information, refer to Note 13. "Federal Income Taxes" in Item 8. "Financial Statements and Supplementary Data." of our 2017 Annual Report.
  
During 2018, we will continue to monitor IRS guidance to complete the analysis of loss reserve discounting.

(b) A reconciliation of federal income tax on income at the corporate rate to the effective tax rate is as follows:
 
 
Quarter ended June 30,
 
Six Months ended June 30,
($ in thousands)
 
2018
 
2017
 
2018
 
2017
Statutory tax rate
 
21
%
 
35

 
21

 
35

Tax at statutory rate
 
$
15,231

 
20,625

 
19,416

 
44,276

Tax-advantaged interest
 
(1,393
)
 
(2,757
)
 
(2,904
)
 
(5,564
)
Dividends received deduction
 
(210
)
 
(625
)
 
(336
)
 
(956
)
Stock-based compensation
 
(82
)
 
(374
)
 
(2,548
)
 
(3,323
)
Other
 
160

 
634

 
1,084

 
204

Federal income tax expense
 
$
13,706

 
17,503

 
14,712

 
34,637