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Equity (Tables)
 6 Months Ended
Jun. 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
 
—

 
991,477

 
(991,477
)
Stock-based compensation (1)
 
—

 
(211,868
)
 
211,868

Balance, June 30, 2018
 
79,137,758

 
15,465,272

 
63,672,486

 
 
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

(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, 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
 
(44,227
)
 
(1,327,195
)
 
(2,986
)
 
(1,374,408
)
Amounts reclassified to (from) AOCI
 
—

 
53,646

 
2,366

 
56,012

Deferred income tax benefit (expense)
 
(11,610
)
 
271,226

 
120

 
259,736

Balance, June 30, 2018
 
$
(142,187
)
 
$
1,198,338

 
$
(51,180
)
 
$
1,004,971

 
 
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

(1)
Includes cash flow hedges of $22,656 and $2,619 as of June 30, 2018 and December 31, 2017, respectively, and $1,131 and $(2,496) as of June 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 six months ended June 30, 2018 and 2017 (dollars in thousands):
 
 
Amount Reclassified from AOCI
 
 
 
 
Three months ended June 30,
 
Six months ended June 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
 
$
(24,642
)
 
$
40,374

 
$
(39,098
)
 
$
28,517

 
Investment related gains (losses), net
Cash flow hedges - Interest rate
 
29

 
—

 
(342
)
 
—

 
(1)
Cash flow hedges - Currency/Interest rate
 
76

 
132

 
221

 
329

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

 
51

 
—

 
101

 
(1)
Deferred policy acquisition costs attributed to unrealized gains and losses
 
(7,835
)
 
4,565

 
(14,427
)
 
10,413

 
(2)
Total
 
(32,372
)
 
45,122

 
(53,646
)
 
39,360

 
 
Provision for income taxes
 
6,945

 
(15,218
)
 
11,623

 
(12,024
)
 
 
Net unrealized gains (losses), net of tax
 
$
(25,427
)
 
$
29,904

 
$
(42,023
)
 
$
27,336

 
 
Amortization of defined benefit plan items:
 
 
 
 
 
 
 
 
 
 
Prior service cost (credit)
 
$
247

 
$
60

 
$
493

 
$
142

 
(3)
Actuarial gains/(losses)
 
(1,267
)
 
(1,539
)
 
(2,859
)
 
(3,077
)
 
(3)
Total
 
(1,020
)
 
(1,479
)
 
(2,366
)
 
(2,935
)
 
 
Provision for income taxes
 
214

 
517

 
497

 
1,027

 
 
Amortization of defined benefit plans, net of tax
 
$
(806
)
 
$
(962
)
 
$
(1,869
)
 
$
(1,908
)
 
 
 
 
 
 
 
 
 
 
 
 
 
Total reclassifications for the period
 
$
(26,233
)
 
$
28,942

 
$
(43,892
)
 
$
25,428

 
 
(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