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Equity (Tables) | 9 Months Ended
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Sep. 30, 2019
Stockholders' Equity Note [Abstract] |
Schedule of Stock by Class [Table Text Block] | The changes in the number of common stock issued, held in treasury and outstanding are as follows for the periods indicated:
|  | Issued |  | Held In Treasury |  | Outstanding
Balance, December 31, 2018 |  | 79,137,758 |  |  | 16,323,390 |  |  | 62,814,368 |
Common stock acquired |  | — |  |  | 546,614 |  |  | (546,614 | )
Stock-based compensation (1) |  | — |  |  | (341,447 | ) |  | 341,447 |
Balance, September 30, 2019 |  | 79,137,758 |  |  | 16,528,557 |  |  | 62,609,201 |
|  | Issued |  | Held In Treasury |  | Outstanding
Balance, December 31, 2017 |  | 79,137,758 |  |  | 14,685,663 |  |  | 64,452,095 |
Common stock acquired |  | — |  |  | 1,750,295 |  |  | (1,750,295 | )
Stock-based compensation (1) |  | — |  |  | (249,068 | ) |  | 249,068 |
Balance, September 30, 2018 |  | 79,137,758 |  |  | 16,186,890 |  |  | 62,950,868 |
(1) Represents net shares issued from treasury pursuant to the Company’s equity-based compensation programs.
Components of Accumulated Other Comprehensive Income | The balance of and changes in each component of accumulated other comprehensive income (loss) (“AOCI”) for the nine months ended September 30, 2019 and 2018 are as follows (dollars in thousands):
|  | Accumulated Currency Translation Adjustments |  | Unrealized Appreciation (Depreciation) of Investments(1) |  | Pension and Postretirement Benefits |  | Total
Balance, December 31, 2018 |  | $ | (168,698 | ) |  | $ | 856,159 |  |  | $ | (50,698 | ) |  | $ | 636,763 |
Other comprehensive income (loss) before reclassifications |  | 16,155 |  |  | 3,526,151 |  |  | (11,735 | ) |  | 3,530,571 |
Amounts reclassified to (from) AOCI |  | — |  |  | (170,531 | ) |  | 3,728 |  |  | (166,803 | )
Deferred income tax benefit (expense) |  | (4,631 | ) |  | (739,230 | ) |  | 1,676 |  |  | (742,185 | )
Balance, September 30, 2019 |  | $ | (157,174 | ) |  | $ | 3,472,549 |  |  | $ | (57,029 | ) |  | $ | 3,258,346 |
|  | Accumulated Currency Translation Adjustments |  | Unrealized Appreciation (Depreciation) of Investments(1) |  | Pension and Postretirement Benefits |  | Total
Balance, December 31, 2017 |  | $ | (86,350 | ) |  | $ | 2,200,661 |  |  | $ | (50,680 | ) |  | $ | 2,063,631 |
Other comprehensive income (loss) before reclassifications |  | (24,977 | ) |  | (1,638,146 | ) |  | (3,391 | ) |  | (1,666,514 | )
Amounts reclassified to (from) AOCI |  | — |  |  | 79,505 |  |  | 3,986 |  |  | 83,491 |
Deferred income tax benefit (expense) |  | (5,398 | ) |  | 340,332 |  |  | (164 | ) |  | 334,770 |
Adoption of new accounting standard |  | (2,573 | ) |  | — |  |  | — |  |  | (2,573 | )
Balance, September 30, 2018 |  | $ | (119,298 | ) |  | $ | 982,352 |  |  | $ | (50,249 | ) |  | $ | 812,805 |
(1) Includes cash flow hedges of $(47,202) and $8,788 as of September 30, 2019 and December 31, 2018, respectively, and $29,043 and $2,619 as of September 30, 2018 and December 31, 2017, respectively. See Note 5 - “Derivative Instruments” for additional information on cash flow hedges.
Reclassification Out Of Accumulated Other Comprehensive Income | The following table presents the amounts of AOCI reclassifications for the three and nine months ended September 30, 2019 and 2018 (dollars in thousands):
|  | Amount Reclassified from AOCI |  |
|  | Three months ended September 30, |  | Nine months ended September 30, |  |
Details about AOCI Components |  | 2019 |  | 2018 |  | 2019 |  | 2018 |  | Affected Line Item in Statements of Income
Net unrealized investment gains (losses): |  |  |  |  |  |  |  |  |  |
Net unrealized gains (losses) on available-for-sale securities |  | $ | 50,537 |  |  | $ | (21,249 | ) |  | $ | 70,513 |  |  | $ | (60,347 | ) |  | Investment related gains (losses), net
Cash flow hedges - Interest rate |  | 255 |  |  | 234 |  |  | 1,107 |  |  | (108 | ) |  | (1)
Cash flow hedges - Currency/Interest rate |  | (38 | ) |  | 50 |  |  | (19 | ) |  | 270 |  |  | (1)
Deferred policy acquisition costs attributed to unrealized gains and losses |  | 21,275 |  |  | (4,893 | ) |  | 98,930 |  |  | (19,320 | ) |  | (2)
Total |  | 72,029 |  |  | (25,858 | ) |  | 170,531 |  |  | (79,505 | ) |  |
Provision for income taxes |  | (14,808 | ) |  | 5,355 |  |  | (35,087 | ) |  | 16,978 |  |  |
Net unrealized gains (losses), net of tax |  | $ | 57,221 |  |  | $ | (20,503 | ) |  | $ | 135,444 |  |  | $ | (62,527 | ) |  |
Amortization of defined benefit plan items: |  |  |  |  |  |  |  |  |  |
Prior service cost (credit) |  | $ | 267 |  |  | $ | 246 |  |  | $ | 804 |  |  | $ | 739 |  |  | (3)
Actuarial gains/(losses) |  | (1,102 | ) |  | (1,866 | ) |  | (4,532 | ) |  | (4,725 | ) |  | (3)
Total |  | (835 | ) |  | (1,620 | ) |  | (3,728 | ) |  | (3,986 | ) |  |
Provision for income taxes |  | 175 |  |  | 340 |  |  | 783 |  |  | 837 |  |  |
Amortization of defined benefit plans, net of tax |  | $ | (660 | ) |  | $ | (1,280 | ) |  | $ | (2,945 | ) |  | $ | (3,149 | ) |  |
Total reclassifications for the period |  | $ | 56,561 |  |  | $ | (21,783 | ) |  | $ | 132,499 |  |  | $ | (65,676 | ) |  |
(1) | See Note 5 - “Derivative Instruments” for additional information on cash flow hedges.
(2) | This AOCI component is included in the computation of the deferred policy acquisition cost. See Note 8 – “Deferred Policy Acquisition Costs” of the 2018 Annual Report for additional details.
(3) This AOCI component is included in the computation of the net periodic pension cost. See Note 10 – “Employee Benefit Plans” for additional details.

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