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Equity (Tables)
 3 Months Ended
Mar. 31, 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)
 
—

 
(86,049
)
 
86,049

Balance, March 31, 2017
 
79,137,758

 
14,749,207

 
64,388,551

 
 
Issued
 
Held In Treasury
 
Outstanding
Balance, December 31, 2015
 
79,137,758

 
13,933,232

 
65,204,526

Common stock acquired
 
—

 
1,232,684

 
(1,232,684
)
Stock-based compensation (1)
 
—

 
(93,568
)
 
93,568

Balance, March 31, 2016
 
79,137,758

 
15,072,348

 
64,065,410

(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, 2017 and 2016 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, 2016
 
$
(172,541
)
 
$
1,355,033

 
$
(43,163
)
 
$
1,139,329

Other comprehensive income (loss) before reclassifications
 
(50,735
)
 
283,443

 
(27
)
 
232,681

Amounts reclassified to (from) AOCI
 
—

 
5,762

 
1,456

 
7,218

Deferred income tax benefit (expense)
 
28,522

 
(86,090
)
 
(505
)
 
(58,073
)
Balance, March 31, 2017
 
$
(194,754
)
 
$
1,558,148

 
$
(42,239
)
 
$
1,321,155

 
 
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, 2015
 
$
(181,151
)
 
$
935,697

 
$
(46,262
)
 
$
708,284

Other comprehensive income (loss) before reclassifications
 
72,695

 
781,293

 
(5,932
)
 
848,056

Amounts reclassified to (from) AOCI
 
—

 
10,237

 
1,551

 
11,788

Deferred income tax benefit (expense)
 
5,038

 
(244,305
)
 
1,522

 
(237,745
)
Balance, March 31, 2016
 
$
(103,418
)
 
$
1,482,922

 
$
(49,121
)
 
$
1,330,383

(1)
Includes cash flow hedges of $7,690 and $(2,496) as of March 31, 2017 and December 31, 2016, respectively, and $(21,794) and $(29,397) as of March 31, 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 months ended March 31, 2017 and 2016 (dollars in thousands):
 
 
Amount Reclassified from AOCI
 
 
 
 
Three months ended March 31,
 
 
Details about AOCI Components
 
2017
 
2016
 
Affected Line Item in 
Statement of Income
Net unrealized investment gains (losses):
 
 
 
 
 
 
Net unrealized gains and losses on available-for-sale securities
 
$
(11,857
)
 
$
(18,291
)
 
Investment related gains (losses), net
Cash flow hedges - Currency/Interest rate
 
197

 
160

 
(1)
Cash flow hedges - Forward bond purchase commitments
 
50

 
788

 
(1)
Deferred policy acquisition costs attributed to unrealized gains and losses
 
5,848

 
7,106

 
(2)
Total
 
(5,762
)
 
(10,237
)
 
 
Provision for income taxes
 
3,194

 
4,649

 
 
Net unrealized gains (losses), net of tax
 
$
(2,568
)
 
$
(5,588
)
 
 
Amortization of defined benefit plan items:
 
 
 
 
 
 
Prior service cost (credit)
 
$
82

 
$
(78
)
 
(3)
Actuarial gains/(losses)
 
(1,538
)
 
(1,473
)
 
(3)
Total
 
(1,456
)
 
(1,551
)
 
 
Provision for income taxes
 
510

 
543

 
 
Amortization of defined benefit plans, net of tax
 
$
(946
)
 
$
(1,008
)
 
 
 
 
 
 
 
 
 
Total reclassifications for the period
 
$
(3,514
)
 
$
(6,596
)
 
 
(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