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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Statement of Comprehensive Income [Abstract]    
Net income, before-tax amount $ 213,732 $ 236,254
Net income income tax (42,695) (49,161)
Net income 171,037 187,093
Before-tax Amount    
Net unrealized gains (losses) arising during the period (621,482) (165,241)
Reclassification adjustment for realized (gains) losses included in net income 0 1,990
Net change (621,482) (163,251)
Income Tax    
Net unrealized gains (losses) arising during the period 147,023 42,781
Reclassification adjustment for realized (gains) losses included in net income 0 (515)
Net change 147,023 42,266
Net of Tax Amount    
Net unrealized gains (losses) arising during the period (474,459) (122,460)
Reclassification adjustment for realized (gains) losses included in net income 0 1,475
Net change (474,459) (120,985)
Before-tax Amount    
Net unrealized gains (losses) arising during the period (135,978) (29,057)
Reclassification adjustment for realized (gains) losses included in net income (2,189) (1,599)
Net change (138,167) (30,656)
Income Tax    
Net unrealized gains (losses) arising during the period 32,361 7,874
Reclassification adjustment for realized (gains) losses included in net income 521 410
Net change 32,882 8,284
Net of Tax Amount    
Net unrealized gains (losses) arising during the period (103,617) (21,183)
Reclassification adjustment for realized (gains) losses included in net income (1,668) (1,189)
Net change (105,285) (22,372)
Total other comprehensive income (loss) (759,649) (193,907)
Other comprehensive income (loss), income tax 179,905 50,550
Total other comprehensive income (loss), net of tax (579,744) (143,357)
Comprehensive income (loss) $ (408,707) $ 43,736