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Equity (Tables) | 6 Months Ended
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Jun. 30, 2017
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, 2016 |  | 79,137,758 |  |  | 14,835,256 |  |  | 64,302,502 |
Stock-based compensation (1) |  | — |  |  | (189,355 | ) |  | 189,355 |
Balance, June 30, 2017 |  | 79,137,758 |  |  | 14,645,901 |  |  | 64,491,857 |
|  | Issued |  | Held In Treasury |  | Outstanding
Balance, December 31, 2015 |  | 79,137,758 |  |  | 13,933,232 |  |  | 65,204,526 |
Common stock acquired |  | — |  |  | 1,352,211 |  |  | (1,352,211 | )
Stock-based compensation (1) |  | — |  |  | (217,434 | ) |  | 217,434 |
Balance, June 30, 2016 |  | 79,137,758 |  |  | 15,068,009 |  |  | 64,069,749 |
(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 six months ended June 30, 2017 and 2016 are as follows (dollars in thousands):
|  | Accumulated Currency Translation Adjustments |  | Unrealized Appreciation (Depreciation) of Investments(1) |  | Pension and Postretirement Benefits |  | Total
Balance, December 31, 2016 |  | $ | (172,541 | ) |  | $ | 1,355,033 |  |  | $ | (43,163 | ) |  | $ | 1,139,329 |
Other comprehensive income (loss) before reclassifications |  | (13,936 | ) |  | 774,688 |  |  | (196 | ) |  | 760,556 |
Amounts reclassified to (from) AOCI |  | — |  |  | (39,360 | ) |  | 2,935 |  |  | (36,425 | )
Deferred income tax benefit (expense) |  | 35,288 |  |  | (225,884 | ) |  | (966 | ) |  | (191,562 | )
Balance, June 30, 2017 |  | $ | (151,189 | ) |  | $ | 1,864,477 |  |  | $ | (41,390 | ) |  | $ | 1,671,898 |
|  | Accumulated Currency Translation Adjustments |  | Unrealized Appreciation (Depreciation) of Investments(1) |  | Pension and Postretirement Benefits |  | Total
Balance, December 31, 2015 |  | $ | (181,151 | ) |  | $ | 935,697 |  |  | $ | (46,262 | ) |  | $ | 708,284 |
Other comprehensive income (loss) before reclassifications |  | 99,374 |  |  | 1,759,753 |  |  | (6,083 | ) |  | 1,853,044 |
Amounts reclassified to (from) AOCI |  | — |  |  | (24,366 | ) |  | 3,467 |  |  | (20,899 | )
Deferred income tax benefit (expense) |  | (11,699 | ) |  | (544,269 | ) |  | 913 |  |  | (555,055 | )
Balance, June 30, 2016 |  | $ | (93,476 | ) |  | $ | 2,126,815 |  |  | $ | (47,965 | ) |  | $ | 1,985,374 |
(1) | Includes cash flow hedges of $1,131 and $(2,496) as of June 30, 2017 and December 31, 2016, respectively, and $(41,192) and $(29,397) as of June 30, 2016 and December 31, 2015, 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 six months ended June 30, 2017 and 2016 (dollars in thousands):
|  | Amount Reclassified from AOCI |  |
|  | Three months ended June 30, |  | Six months ended June 30, |  |
Details about AOCI Components |  | 2017 |  | 2016 |  | 2017 |  | 2016 |  | Affected Line Item in Statements of Income
Net unrealized investment gains (losses): |  |  |  |  |  |  |  |  |  |
Net unrealized gains and losses on available-for-sale securities |  | $ | 40,374 |  |  | $ | 30,190 |  |  | $ | 28,517 |  |  | $ | 11,899 |  |  | Investment related gains (losses), net
Cash flow hedges - Currency/Interest rate |  | 132 |  |  | 93 |  |  | 329 |  |  | 253 |  |  | (1)
Cash flow hedges - Forward bond purchase commitments |  | 51 |  |  | (1,045 | ) |  | 101 |  |  | (257 | ) |  | (1)
Deferred policy acquisition costs attributed to unrealized gains and losses |  | 4,565 |  |  | 5,365 |  |  | 10,413 |  |  | 12,471 |  |  | (2)
Total |  | 45,122 |  |  | 34,603 |  |  | 39,360 |  |  | 24,366 |  |  |
Provision for income taxes |  | (15,218 | ) |  | (9,646 | ) |  | (12,024 | ) |  | (4,996 | ) |  |
Net unrealized gains (losses), net of tax |  | $ | 29,904 |  |  | $ | 24,957 |  |  | $ | 27,336 |  |  | $ | 19,370 |  |  |
Amortization of defined benefit plan items: |  |  |  |  |  |  |  |  |  |
Prior service cost (credit) |  | $ | 60 |  |  | $ | (75 | ) |  | $ | 142 |  |  | $ | (153 | ) |  | (3)
Actuarial gains/(losses) |  | (1,539 | ) |  | (1,841 | ) |  | (3,077 | ) |  | (3,314 | ) |  | (3)
Total |  | (1,479 | ) |  | (1,916 | ) |  | (2,935 | ) |  | (3,467 | ) |  |
Provision for income taxes |  | 517 |  |  | 670 |  |  | 1,027 |  |  | 1,213 |  |  |
Amortization of defined benefit plans, net of tax |  | $ | (962 | ) |  | $ | (1,246 | ) |  | $ | (1,908 | ) |  | $ | (2,254 | ) |  |
Total reclassifications for the period |  | $ | 28,942 |  |  | $ | 23,711 |  |  | $ | 25,428 |  |  | $ | 17,116 |  |  |
(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 2016 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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- Definition Tabular disclosure of an entity's stock, including par or stated value per share, number and dollar amount of share subscriptions, shares authorized, shares issued, shares outstanding, number and dollar amount of shares held in an employee trust, dividend per share, total dividends, share conversion features, par value plus additional paid in capital, the value of treasury stock and other information necessary to a fair presentation, and EPS information. Stock by class includes common, convertible, and preferred stocks which are not redeemable or redeemable solely at the option of the issuer. Includes preferred stock with redemption features that are solely within the control of the issuer and mandatorily redeemable stock if redemption is required to occur only upon liquidation or termination of the reporting entity. If more than one issue is outstanding, state the title of each issue and the corresponding dollar amount; dollar amount of any shares subscribed but unissued and the deduction of subscriptions receivable there from; number of shares authorized, issued, and outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21506-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=65877616&loc=d3e177068-122764 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(d)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21553-112644 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21475-112644 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65888546&loc=d3e21300-112643 Reference 10: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(27)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 11: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21521-112644 Reference 12: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21484-112644 Reference 13: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21538-112644 Reference 14: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=84159872&loc=d3e21488-112644 + Details
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