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Statements of Cash Flow (Tables)
12 Months Ended
Dec. 31, 2020
Supplemental Cash Flow Information [Abstract]  
Schedule of Cash Flow, Supplemental Disclosures
($ in thousands)202020192018
Cash paid during the period for:   
Interest$30,464 25,089 23,992 
Federal income tax47,000 55,825 29,193 
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases9,498 8,138 — 
Operating cash flows from financing leases15 16 — 
Financing cash flows from finance leases550 977 5,646 
Non-cash items:
Corporate actions related to fixed income securities, AFS1
55,446 61,369 52,277 
Corporate actions related to fixed income securities, HTM1
2,589 — — 
Corporate actions related to equity securities1
10,890 14,250 944 
Assets acquired under finance lease arrangements324 824 4,119 
Assets acquired under operating lease arrangements22,390 13,808 — 
Non-cash purchase of property and equipment590 89 291 
Schedule of Cash and Cash Equivalents
($ in thousands)December 31, 2020December 31, 2019
Cash$394 300 
Restricted cash14,837 7,675 
Total cash and restricted cash shown in the Statements of Cash Flows$15,231 7,975