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Supplemental Information About Changes to Accumulated Other Comprehensive Income (Tables)
 6 Months Ended
Jun. 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 six month periods ended June 30, 2020 and 2019:
 Three Months Ended June 30, 2020
 Available
for Sale
Assets		Deferred
Acquisition
Costs		Foreign
Exchange		Pension
Adjustments		Total
Balance at April 1, 2020
$1,222,159  $(5,613) $(9,621) $(140,678) $1,066,247  
Other comprehensive income (loss) before reclassifications, net of tax1,151,193  301  13,387  —  1,164,881  
Reclassifications, net of tax(2,520) —  —  3,285  765  
Other comprehensive income (loss)1,148,673  301  13,387  3,285  1,165,646  
Balance at June 30, 2020
$2,370,832  $(5,312) $3,766  $(137,393) $2,231,893  

 Three Months Ended June 30, 2019
 Available
for Sale
Assets		Deferred
Acquisition
Costs		Foreign
Exchange		Pension
Adjustments		Total
Balance at April 1, 2019
$984,701  $(6,691) $8,937  $(116,880) $870,067  
Other comprehensive income (loss) before reclassifications, net of tax568,073  135  (31) —  568,177  
Reclassifications, net of tax(666) —  —  1,672  1,006  
Other comprehensive income (loss)567,407  135  (31) 1,672  569,183  
Balance at June 30, 2019
$1,552,108  $(6,556) $8,906  $(115,208) $1,439,250  

 Six Months Ended June 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 tax368,257  604  (8,292) —  360,569  
Reclassifications, net of tax19,925  —  —  6,569  26,494  
Other comprehensive income (loss)388,182  604  (8,292) 6,569  387,063  
Balance at June 30, 2020
$2,370,832  $(5,312) $3,766  $(137,393) $2,231,893  

 Six Months Ended June 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 tax1,119,007  (2,393) 2,411  —  1,119,025  
Reclassifications, net of tax(2,597) —  —  3,347  750  
Other comprehensive income (loss)1,116,410  (2,393) 2,411  3,347  1,119,775  
Balance at June 30, 2019
$1,552,108  $(6,556) $8,906  $(115,208) $1,439,250  
Summary of Reclassifications Out of Accumulated Other Comprehensive Income Reclassification adjustments out of Accumulated Other Comprehensive Income are presented below for the three and six month periods ended June 30, 2020 and 2019.
  Three Months Ended
June 30,		Six Months Ended June 30,Affected line items in the Statement of Operations
Component Line Item2020201920202019
Unrealized investment (gains) losses on available for sale assets:
Realized (gains) losses$(5,063) $(2,237) $21,857  $(5,907) Realized (gains) losses
Amortization of (discount) premium1,873  1,394  3,365  2,620  Net investment income
Total before tax(3,190) (843) 25,222  (3,287) 
Tax670  177  (5,297) 690  Income taxes
Total after-tax(2,520) (666) 19,925  (2,597) 
Pension adjustments:
Amortization of prior service cost158  158  316  316  Other operating expense
Amortization of actuarial (gain) loss4,000  1,960  7,999  3,922  Other operating expense
Total before tax4,158  2,118  8,315  4,238  
Tax(873) (446) (1,746) (891) Income taxes
Total after-tax3,285  1,672  6,569  3,347  
Total reclassification (after-tax)
$765  $1,006  $26,494  $750