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Equity (Tables)
 6 Months Ended
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