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Income Taxes (Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax asset:    
Loss reserve discounting $ 162,636 $ 141,877
Unearned premiums 163,143 134,971
Net operating losses & foreign tax credits 88,502 90,601
Other-than-temporary impairments 5,176 5,973
Employee compensation plans 61,301 60,551
Other 54,269 59,230
Gross deferred tax asset 535,027 493,203
Less valuation allowance (75,230) (79,488)
Deferred tax asset 459,797 413,715
Deferred tax liability:    
Amortization of intangibles 12,787 12,761
Loss reserve discounting - transition rule 19,796 24,747
Deferred policy acquisition costs 137,893 113,084
Unrealized investment gains 36,850 100,241
Property, furniture and equipment 43,186 48,235
Investment funds 101,999 77,783
Other 67,331 49,970
Deferred tax liability 419,842 426,821
Net deferred tax asset (liability) 39,955  
Net deferred tax asset (liability)   (13,106)
Operating Loss Carryforwards [Line Items]    
Income taxes receivable 2,500  
Current federal income taxes   35,400
Valuation allowance 75,200 $ 79,500
Foreign Tax Authority    
Operating Loss Carryforwards [Line Items]    
Operating loss carryforwards, subject to expire 6,800  
Operating loss carryforwards, not subject to expire $ 238,200