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Equity (Tables)
 9 Months Ended
Sep. 30, 2018
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, 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

 
 
Issued
 
Held In Treasury
 
Outstanding
Balance, December 31, 2016
 
79,137,758

 
14,835,256

 
64,302,502

Common stock acquired
 
—

 
208,680

 
(208,680
)
Stock-based compensation (1)
 
—

 
(274,449
)
 
274,449

Balance, September 30, 2017
 
79,137,758

 
14,769,487

 
64,368,271

(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, 2018 and 2017 are as follows (dollars in thousands):
 
 
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

 
 
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
 
23,117

 
671,564

 
(191
)
 
694,490

Amounts reclassified to (from) AOCI
 
—

 
(51,407
)
 
4,006

 
(47,401
)
Deferred income tax benefit (expense)
 
44,968

 
(204,287
)
 
(1,342
)
 
(160,661
)
Balance, September 30, 2017
 
$
(104,456
)
 
$
1,770,903

 
$
(40,690
)
 
$
1,625,757

(1)
Includes cash flow hedges of $29,043 and $2,619 as of September 30, 2018 and December 31, 2017, respectively, and $347 and $(2,496) as of September 30, 2017 and December 31, 2016, 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, 2018 and 2017 (dollars in thousands):
 
 
Amount Reclassified from AOCI
 
 
 
 
Three months ended September 30,
 
Nine months ended September 30,
 
 
Details about AOCI Components
 
2018
 
2017
 
2018
 
2017
 
Affected Line Item in 
Statements of Income
Net unrealized investment gains (losses):
 
 
 
 
 
 
 
 
 
 
Net unrealized gains (losses) on available-for-sale securities
 
$
(21,249
)
 
$
10,515

 
$
(60,347
)
 
$
39,032

 
Investment related gains (losses), net
Cash flow hedges - Interest rate
 
234

 
—

 
(108
)
 
—

 
(1)
Cash flow hedges - Currency/Interest rate
 
50

 
230

 
270

 
560

 
(1)
Cash flow hedges - Forward bond purchase commitments
 
—

 
224

 
—

 
286

 
(1)
Deferred policy acquisition costs attributed to unrealized gains and losses
 
(4,893
)
 
1,116

 
(19,320
)
 
11,529

 
(2)
Total
 
(25,858
)
 
12,085

 
(79,505
)
 
51,407

 
 
Provision for income taxes
 
5,355

 
(3,991
)
 
16,978

 
(16,015
)
 
 
Net unrealized gains (losses), net of tax
 
$
(20,503
)
 
$
8,094

 
$
(62,527
)
 
$
35,392

 
 
Amortization of defined benefit plan items:
 
 
 
 
 
 
 
 
 
 
Prior service cost (credit)
 
$
246

 
$
590

 
$
739

 
$
732

 
(3)
Actuarial gains/(losses)
 
(1,866
)
 
(1,661
)
 
(4,725
)
 
(4,738
)
 
(3)
Total
 
(1,620
)
 
(1,071
)
 
(3,986
)
 
(4,006
)
 
 
Provision for income taxes
 
340

 
375

 
837

 
1,402

 
 
Amortization of defined benefit plans, net of tax
 
$
(1,280
)
 
$
(696
)
 
$
(3,149
)
 
$
(2,604
)
 
 
 
 
 
 
 
 
 
 
 
 
 
Total reclassifications for the period
 
$
(21,783
)
 
$
7,398

 
$
(65,676
)
 
$
32,788

 
 
(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 2017 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