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Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Components of Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Net unrealized investment gains (losses) arising during the year |  |  |  |  |  |  |  |  |  | $ 220,139 | $ (81,834) | $ 69,052
Income tax (expense) benefit |  |  |  |  |  |  |  |  |  | (46,229) | 17,188 | (21,505)
Net of taxes |  |  |  |  |  |  |  |  |  | 173,910 | (64,646) | 47,547
Net changes in benefit plan assets and obligations |  |  |  |  |  |  |  |  |  | 29,129 | (19,958) | (8,983)
Income tax (expense) benefit |  |  |  |  |  |  |  |  |  | (6,117) | 4,191 | 3,144
Net of taxes |  |  |  |  |  |  |  |  |  | 23,012 | (15,767) | (5,839)
Net changes in unrealized foreign currency translation adjustment |  |  |  |  |  |  |  |  |  | 0 | 0 | 45
Income tax benefit (expense) |  |  |  |  |  |  |  |  |  | 0 | 0 | (14)
Net of taxes |  |  |  |  |  |  |  |  |  | 0 | 0 | 31
Total other comprehensive income (loss) |  |  |  |  |  |  |  |  |  | 249,268 | (101,792) | 60,114
Total income tax (expense) benefit, net |  |  |  |  |  |  |  |  |  | (52,346) | 21,379 | (18,375)
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  | 196,922 | (80,413) | 41,739
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total reclassifications |  |  |  |  |  |  |  |  |  | 847,977 | 844,150 | 784,496
Income tax (expense) benefit | $ (45,599) | $ (46,186) | $ (43,433) | $ (38,996) | $ (36,963) | $ (49,994) | $ (50,708) | $ (36,388) |  | (174,214) | (174,053) | (428,735)
Net income | 177,110 | $ 176,934 | $ 167,778 | 151,941 | 157,746 | $ 181,900 | $ 186,814 | 143,637 |  | 673,763 | 670,097 | 355,761
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | 3,581,891 |  |  |  | 3,154,526 |  | 3,581,891 | 3,154,526 |
Less: Amounts reclassified for lower enacted corporate tax rate |  |  |  |  |  |  |  |  |  |  |  | 10,422
Balance, end of year | 4,309,234 |  |  |  | 3,581,891 |  |  |  | $ 3,154,526 | 4,309,234 | 3,581,891 | 3,154,526
Accumulated other comprehensive loss |  |  |  |  |  |  |  |  |  |  |  |
Components of Other Comprehensive Income (Loss) [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax |  |  |  |  |  |  |  |  |  | 196,922 | (80,413) | 41,739
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | (124,214) |  |  |  | (43,783) |  | (124,214) | (43,783) | (75,100)
Cumulative effect of adopting the accounting standard update for financial instruments |  |  |  |  |  |  |  |  | (18) |  |  | (18)
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  |  |  |  | 193,400 | (87,736) | 40,651
Less: Amounts reclassified from AOCL |  |  |  |  |  |  |  |  |  | (3,522) | (7,323) | (1,088)
Less: Amounts reclassified for lower enacted corporate tax rate |  |  |  |  |  |  |  |  | 10,400 |  |  | 10,422
Balance, end of year | 72,708 |  |  |  | (124,214) |  |  |  | (43,783) | 72,708 | (124,214) | (43,783)
Net unrealized gains and losses on available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | (35,389) |  |  |  | 29,275 |  | (35,389) | 29,275 | (20,797)
Cumulative effect of adopting the accounting standard update for financial instruments |  |  |  |  |  |  |  |  | (18) |  |  | (18)
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  |  |  |  | 176,784 | (70,206) | 45,870
Less: Amounts reclassified from AOCL |  |  |  |  |  |  |  |  |  | 2,874 | (5,560) | (1,677)
Less: Amounts reclassified for lower enacted corporate tax rate |  |  |  |  |  |  |  |  |  |  |  | (2,525)
Balance, end of year | 138,521 |  |  |  | (35,389) |  |  |  | 29,275 | 138,521 | (35,389) | 29,275
Net benefit plan assets and obligations recognized in shareholders' equity |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | (88,825) |  |  |  | (73,058) |  | (88,825) | (73,058) | (54,272)
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  |  |  |  | 16,616 | (17,530) | (5,250)
Less: Amounts reclassified from AOCL |  |  |  |  |  |  |  |  |  | (6,396) | (1,763) | 589
Less: Amounts reclassified for lower enacted corporate tax rate |  |  |  |  |  |  |  |  |  |  |  | 12,947
Balance, end of year | (65,813) |  |  |  | (88,825) |  |  |  | (73,058) | (65,813) | (88,825) | (73,058)
Net unrealized foreign currency translation |  |  |  |  |  |  |  |  |  |  |  |
AOCI Attributable to Parent, Net of Tax [Roll Forward] |  |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of year |  |  |  | $ 0 |  |  |  | $ 0 |  | 0 | 0 | (31)
Other comprehensive income (loss) before reclassifications |  |  |  |  |  |  |  |  |  | 0 | 0 | 31
Less: Amounts reclassified from AOCL |  |  |  |  |  |  |  |  |  | 0 | 0 | 0
Less: Amounts reclassified for lower enacted corporate tax rate |  |  |  |  |  |  |  |  |  |  |  | 0
Balance, end of year | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | 0 | 0 | 0
Reclassification from Accumulated Other Comprehensive Income |  |  |  |  |  |  |  |  |  |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total reclassifications |  |  |  |  |  |  |  |  |  | (4,460) | (9,269) | (1,674)
Income tax (expense) benefit |  |  |  |  |  |  |  |  |  | 938 | 1,946 | 586
Net income |  |  |  |  |  |  |  |  |  | (3,522) | (7,323) | (1,088)
Reclassification from Accumulated Other Comprehensive Income | Net unrealized gains and losses on available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total reclassifications |  |  |  |  |  |  |  |  |  | 3,637 | (7,037) | (2,580)
Income tax (expense) benefit |  |  |  |  |  |  |  |  |  | (763) | 1,477 | 903
Net income |  |  |  |  |  |  |  |  |  | 2,874 | (5,560) | (1,677)
Reclassification from Accumulated Other Comprehensive Income | Net benefit plan assets and obligations recognized in shareholders' equity |  |  |  |  |  |  |  |  |  |  |  |
Amounts Reclassified From Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total reclassifications |  |  |  |  |  |  |  |  |  | (8,097) | (2,232) | 906
Income tax (expense) benefit |  |  |  |  |  |  |  |  |  | 1,701 | 469 | (317)
Net income |  |  |  |  |  |  |  |  |  | $ (6,396) | $ (1,763) | $ 589

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