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Equity (Tables) | 3 Months Ended
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Mar. 31, 2019
Stockholders' Equity Note [Abstract] |
Schedule of Stock by Class [Table Text Block] | The changes in number of common stock shares, 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 |  | — |  |  | 344,237 |  |  | (344,237 | )
Stock-based compensation (1) |  | — |  |  | (74,216 | ) |  | 74,216 |
Balance, March 31, 2019 |  | 79,137,758 |  |  | 16,593,411 |  |  | 62,544,347 |
|  | Issued |  | Held In Treasury |  | Outstanding
Balance, December 31, 2017 |  | 79,137,758 |  |  | 14,685,663 |  |  | 64,452,095 |
Stock-based compensation (1) |  | — |  |  | (60,678 | ) |  | 60,678 |
Balance, March 31, 2018 |  | 79,137,758 |  |  | 14,624,985 |  |  | 64,512,773 |
(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 three months ended March 31, 2019 and 2018 are as follows (dollars in thousands):
|  | Accumulated Other Comprehensive Income (Loss), Net of Income Tax
|  | 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 |  | 18,462 |  |  | 1,437,058 |  |  | (1,787 | ) |  | 1,453,733 |
Amounts reclassified to (from) AOCI |  |  |  |  | (14,694 | ) |  | 1,286 |  |  | (13,408 | )
Deferred income tax benefit (expense) |  | 2,924 |  |  | (314,153 | ) |  | 106 |  |  | (311,123 | )
Balance, March 31, 2019 |  | $ | (147,312 | ) |  | $ | 1,964,370 |  |  | $ | (51,093 | ) |  | $ | 1,765,965 |
|  | Accumulated Other Comprehensive Income (Loss), Net of Income Tax
|  | 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 |  | 5,696 |  |  | (827,701 | ) |  | (1,910 | ) |  | (823,915 | )
Amounts reclassified to (from) AOCI |  | — |  |  | 21,274 |  |  | 1,346 |  |  | 22,620 |
Deferred income tax benefit (expense) |  | (6,856 | ) |  | 172,823 |  |  | 93 |  |  | 166,060 |
Balance, March 31, 2018 |  | $ | (87,510 | ) |  | $ | 1,567,057 |  |  | $ | (51,151 | ) |  | $ | 1,428,396 |
(1) | Includes cash flow hedges of $(1,902) and $8,788 as of March 31, 2019 and December 31, 2018, respectively, and $20,662 and $2,619 as of March 31, 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 months ended March 31, 2019 and 2018 (dollars in thousands):
|  | Amount Reclassified from AOCI |  |
|  | Three months ended March 31, |  |
Details about AOCI Components |  | 2019 |  | 2018 |  | Affected Line Item in Statement of Income
Net unrealized investment gains (losses): |  |  |  |  |  |
Net unrealized gains (losses) on available-for-sale securities |  | $ | (273 | ) |  | $ | (14,456 | ) |  | Investment related gains (losses), net
Cash flow hedges - Interest rate |  | 469 |  |  | (370 | ) |  | (1)
Cash flow hedges - Currency/Interest rate |  | 25 |  |  | 144 |  |  | (1)
Deferred policy acquisition costs attributed to unrealized gains and losses |  | 14,473 |  |  | (6,592 | ) |  | (2)
Total |  | 14,694 |  |  | (21,274 | ) |  |
Provision for income taxes |  | (3,006 | ) |  | 4,678 |  |  |
Net unrealized gains (losses), net of tax |  | $ | 11,688 |  |  | $ | (16,596 | ) |  |
Amortization of defined benefit plan items: |  |  |  |  |  |
Prior service cost (credit) |  | $ | 269 |  |  | $ | 246 |  |  | (3)
Actuarial gains/(losses) |  | (1,555 | ) |  | (1,592 | ) |  | (3)
Total |  | (1,286 | ) |  | (1,346 | ) |  |
Provision for income taxes |  | 270 |  |  | 283 |  |  |
Amortization of defined benefit plans, net of tax |  | $ | (1,016 | ) |  | $ | (1,063 | ) |  |
Total reclassifications for the period |  | $ | 10,672 |  |  | $ | (17,659 | ) |  |
(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 detai

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