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Statements of Cash Flow (Cash Flow Supplemental Disclosures) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Interest $ 25,089 $ 23,992 $ 23,905
Federal income tax 55,825 29,193 62,000
Operating cash flows from operating leases [1] 8,138 0 0
Operating cash flows from financing leases 16 0 0
Financing cash flows from financing leases 977 5,646 4,121
Corporate actions related to equity securities [2] 14,250 944 4,725
Assets acquired under finance lease arrangements 824 4,119 278
Assets acquired under operating lease arrangements [1] 13,808 0 0
Non-cash purchase of property and equipment 89 291 0
AFS Fixed Income Securities [Member]      
Corporate actions related to fixed income securities, AFS [2] $ 61,369 $ 52,277 $ 22,511
[1]
1Upon adoption of ASU 2016-02, effective January 1, 2019, we are required to disclose cash paid for amounts included in the measurement of operating lease liabilities, as well as supplemental non-cash information on operating lease liabilities arising from obtaining operating lease assets.
[2]
2Examples of corporate actions include exchanges, non-cash acquisitions, and stock-splits.