v3.26.1
Accumulated Other Comprehensive Income (Loss) - Summary of Changes in Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at the beginning of the period $ 3,849,909 $ 2,855,060 $ 3,842,246 $ 2,841,774
Other comprehensive income (loss) before reclassifications 2,146 (119) 1,881 (1,608)
(Gain) loss reclassified to net income 1,885 (1,027) 1,416 (1,950)
Pension adjustment 838 0 838 0
Income tax (expense) benefit (944) 273 (764) 866
Other comprehensive income (loss) 3,925 (873) 3,371 (2,692)
Balance at the end of the period 4,033,973 3,711,644 4,033,973 3,711,644
Total        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at the beginning of the period (2,381) 149 (1,827) 1,968
Other comprehensive income (loss) 3,925 (873) 3,371 (2,692)
Balance at the end of the period 1,544 (724) 1,544 (724)
AFS Fixed Maturity Securities        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at the beginning of the period 0 0 0 0
Other comprehensive income (loss) before reclassifications (2,279) 0 (2,279) 0
(Gain) loss reclassified to net income 2,324 0 2,324 0
Pension adjustment 0   0  
Income tax (expense) benefit 0 0 0 0
Other comprehensive income (loss) 45 0 45 0
Balance at the end of the period 45 0 45 0
Derivative Instruments        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at the beginning of the period (1,543) 1,077 (989) 2,896
Other comprehensive income (loss) before reclassifications 4,425 (119) 4,160 (1,608)
(Gain) loss reclassified to net income (439) (1,027) (908) (1,950)
Pension adjustment 0   0  
Income tax (expense) benefit (944) 273 (764) 866
Other comprehensive income (loss) 3,042 (873) 2,488 (2,692)
Balance at the end of the period 1,499 204 1,499 204
Pension        
AOCI Attributable to Parent, Net of Tax [Roll Forward]        
Balance at the beginning of the period (838) (928) (838) (928)
Other comprehensive income (loss) before reclassifications 0 0 0 0
(Gain) loss reclassified to net income 0 0 0 0
Pension adjustment 838   838  
Income tax (expense) benefit 0 0 0 0
Other comprehensive income (loss) 838 0 838 0
Balance at the end of the period $ 0 $ (928) $ 0 $ (928)