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Consolidated Statements of Comprehensive Income - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Statement of Comprehensive Income [Abstract]      
Net income, Before-tax Amount $ 484,665 $ 765,015 $ 547,354
Net income, Income Tax (110,970) (201,235) (118,878)
Net income 373,695 563,780 428,476
Before-tax Amount      
Net unrealized gains (losses) arising during the period 99,193 (8,570) 0
Reclassification adjustment for realized (gains) losses included in net income (2,765) 0 0
Net change 96,428 (8,570) 0
Income Tax      
Net unrealized gains (losses) arising during the period 25,691 (2,220) 0
Reclassification adjustment for realized (gains) losses included in net income 716 0 0
Net change (24,975) 2,220 0
Net of Tax Amount      
Net unrealized gains (losses) arising during the period 73,502 (6,350) 0
Reclassification adjustment for realized (gains) losses included in net income (2,049) 0 0
Net change 71,453 (6,350) 0
Before-tax Amount      
Net unrealized gains (losses) arising during the period 108,626 217,501 (44,565)
Reclassification adjustment for realized (gains) losses included in net income (78,931) 7,659 1,296
Net change 29,695 225,160 (43,269)
Income Tax      
Net unrealized gains (losses) arising during the period (28,135) (56,331) 11,542
Reclassification adjustment for realized (gains) losses included in net income 20,443 (1,984) (336)
Net change (7,692) (58,315) 11,206
Net of Tax Amount      
Net unrealized gains (losses) arising during the period 80,491 161,170 (33,023)
Reclassification adjustment for realized (gains) losses included in net income (58,488) 5,675 960
Net change 22,003 166,845 (32,063)
Before-tax Amount      
Actuarial gains (losses) arising during the period 0 (510) (46)
Reclassification adjustment for realized (gains) losses included in net income (618) (70) (132)
Net change (618) (580) (178)
Income Tax      
Actuarial gains (losses) arising during the period 0 132 12
Reclassification adjustment for realized (gains) losses included in net income 156 14 34
Net change 156 146 46
Net of Tax Amount      
Actuarial gains (losses) arising during the period 0 (378) (34)
Reclassification adjustment for realized (gains) losses included in net income (462) (56) (98)
Net change (462) (434) (132)
Other comprehensive income (loss), Before-tax Amount 125,505 216,010 (43,447)
Other comprehensive income (loss), Income Tax (32,511) (55,949) 11,252
Net current period other comprehensive income (loss) 92,994 160,061 (32,195)
Comprehensive income $ 466,689 $ 723,841 $ 396,281