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Quarterly Financial Information
 12 Months Ended
Dec. 31, 2020
Quarterly Financial Information Disclosure [Abstract]  
Quarterly Financial Information Quarterly Financial Information
First QuarterSecond QuarterThird QuarterFourth Quarter
(unaudited, $ in thousands, except per share data)20202019202020192020201920202019
Net premiums earned$651,703 632,573 630,671 642,619 694,541 653,620 704,899 668,359 
Net investment income earned55,967 50,618 34,444 58,505 68,185 55,826 68,511 57,594 
Net realized and unrealized (losses) gains (44,666)13,451 12,649 4,027 7,721 (2,183)20,079 (873)
Other income1,825 2,320 4,683 3,053 6,119 3,162 4,943 3,820 
Total revenues664,829 698,962 682,447 708,204 776,566 710,425 798,432 728,900 
Income before federal income taxes15,997 73,694 42,693 90,225 85,257 71,178 159,041 101,293 
Net income15,236 61,348 34,183 72,266 69,875 56,150 127,061 81,859 
Net income available to common stockholders15,236 61,348 34,183 72,266 69,875 56,150 127,061 81,859 
Net income available to common stockholders per common share:        
Basic0.26 1.04 0.57 1.22 1.17 0.94 2.12 1.38 
Diluted0.25 1.02 0.57 1.21 1.16 0.93 2.10 1.36 
The addition of all quarters may not agree to annual amounts on the Financial Statements due to rounding.