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Supplemental Information About Changes to Accumulated Other Comprehensive Income (Tables)
 9 Months Ended
Sep. 30, 2020
Equity [Abstract]  
Schedule of Change in Balance by Component of Accumulated Other Comprehensive Income An analysis of the change in balance by component of Accumulated Other Comprehensive Income is as follows for the three and nine month periods ended September 30, 2020 and 2019:
 Three Months Ended September 30, 2020
 Available
for Sale
Assets		Deferred
Acquisition
Costs		Foreign
Exchange		Pension
Adjustments		Total
Balance at July 1, 2020
$2,370,832 $(5,312)$3,766 $(137,393)$2,231,893 
Other comprehensive income (loss) before reclassifications, net of tax301,423 304 4,364 — 306,091 
Reclassifications, net of tax9,352 — — 3,283 12,635 
Other comprehensive income (loss)310,775 304 4,364 3,283 318,726 
Balance at September 30, 2020
$2,681,607 $(5,008)$8,130 $(134,110)$2,550,619 

 Three Months Ended September 30, 2019
 Available
for Sale
Assets		Deferred
Acquisition
Costs		Foreign
Exchange		Pension
Adjustments		Total
Balance at July 1, 2019
$1,552,108 $(6,556)$8,906 $(115,208)$1,439,250 
Other comprehensive income (loss) before reclassifications, net of tax513,812 318 (3,224)— 510,906 
Reclassifications, net of tax(8,706)— — 1,674 (7,032)
Other comprehensive income (loss)505,106 318 (3,224)1,674 503,874 
Balance at September 30, 2019
$2,057,214 $(6,238)$5,682 $(113,534)$1,943,124 

 Nine Months Ended September 30, 2020
 Available
for Sale
Assets		Deferred
Acquisition
Costs		Foreign
Exchange		Pension
Adjustments		Total
Balance at January 1, 2020
$1,982,650 $(5,916)$12,058 $(143,962)$1,844,830 
Other comprehensive income (loss) before reclassifications, net of tax669,680 908 (3,928)— 666,660 
Reclassifications, net of tax29,277 — — 9,852 39,129 
Other comprehensive income (loss)698,957 908 (3,928)9,852 705,789 
Balance at September 30, 2020
$2,681,607 $(5,008)$8,130 $(134,110)$2,550,619 

 Nine Months Ended September 30, 2019
 Available
for Sale
Assets		Deferred
Acquisition
Costs		Foreign
Exchange		Pension
Adjustments		Total
Balance at January 1, 2019
$435,698 $(4,163)$6,495 $(118,555)$319,475 
Other comprehensive income (loss) before reclassifications, net of tax1,632,819 (2,075)(813)— 1,629,931 
Reclassifications, net of tax(11,303)— — 5,021 (6,282)
Other comprehensive income (loss)1,621,516 (2,075)(813)5,021 1,623,649 
Balance at September 30, 2019
$2,057,214 $(6,238)$5,682 $(113,534)$1,943,124 
Summary of Reclassifications Out of Accumulated Other Comprehensive Income Reclassification adjustments out of Accumulated Other Comprehensive Income are presented below for the three and nine month periods ended September 30, 2020 and 2019.
  Three Months Ended
September 30,		Nine Months Ended September 30,Affected line items in the Statement of Operations
Component Line Item2020201920202019
Unrealized investment (gains) losses on available for sale assets:
Realized (gains) losses$10,276 $(12,430)$32,133 $(18,337)Realized (gains) losses
Amortization of (discount) premium1,562 1,410 4,927 4,030 Net investment income
Total before tax11,838 (11,020)37,060 (14,307)
Tax(2,486)2,314 (7,783)3,004 Income taxes
Total after-tax9,352 (8,706)29,277 (11,303)
Pension adjustments:
Amortization of prior service cost158 158 474 474 Other operating expense
Amortization of actuarial (gain) loss3,998 1,959 11,997 5,881 Other operating expense
Total before tax4,156 2,117 12,471 6,355 
Tax(873)(443)(2,619)(1,334)Income taxes
Total after-tax3,283 1,674 9,852 5,021 
Total reclassification (after-tax)
$12,635 $(7,032)$39,129 $(6,282)