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Equity (Tables)
 12 Months Ended
Dec. 31, 2018
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [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, 2015
 
79,137,758

 
13,933,232

 
65,204,526

Common Stock acquired
 
—

 
1,356,892

 
(1,356,892
)
Stock-based compensation (1)
 
—

 
(454,868
)
 
454,868

Balance, December 31, 2016
 
79,137,758

 
14,835,256

 
64,302,502

Common Stock acquired
 
—

 
208,680

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

 
(358,273
)
 
358,273

Balance, December 31, 2017
 
79,137,758

 
14,685,663

 
64,452,095

Common Stock acquired
 
—

 
1,932,055

 
(1,932,055
)
Stock-based compensation (1)
 
—

 
(294,328
)
 
294,328

Balance, December 31, 2018
 
79,137,758

 
16,323,390

 
62,814,368

(1)
Represents net shares issued from treasury pursuant to the Company’s stock-based compensation programs.
Class of Treasury Stock [Table Text Block]
The following table summarizes the Company’s current share repurchase program activity for the years ended 2018 and 2017 (dollar amounts in thousands, except per share amounts):
Year of Repurchase
 
Shares Repurchased
 
Amount Paid
 
Average Per Share
2018
 
1,932,055

 
$
283,524

 
$
146.75

2017
 
208,680

 
26,897

 
$
128.89

Total
 
2,140,735

 
$
310,421

 
Schedule of Comprehensive Income (Loss) [Table Text Block]
Accumulated other comprehensive income (loss)
The following table presents the components of the Company’s other comprehensive income (loss) for the years ended December 31, 2018, 2017 and 2016 (dollars in thousands):
For the year ended December 31, 2018:
 
 
Before-Tax Amount
 
Tax (Expense) Benefit
 
After-Tax Amount
Foreign currency translation adjustments:
 
 
 
 
 
 
Change arising during year
 
$
(148,018
)
 
$
(759
)
 
$
(148,777
)
Foreign currency swap
 
87,344

 
(18,342
)
 
69,002

Net foreign currency translation adjustments
 
(60,674
)
 
(19,101
)
 
(79,775
)
Unrealized gains on investments:(1)
 
 
 
 
 
 
Unrealized net holding gains arising during the year
 
(1,834,656
)
 
393,653

 
(1,441,003
)
Less: Reclassification adjustment for net gains realized in net income
 
(122,221
)
 
25,720

 
(96,501
)
Net unrealized gains
 
(1,712,435
)
 
367,933

 
(1,344,502
)
Unrealized pension and postretirement benefits:
 
 
 
 
 
 
Net prior service cost arising during the year
 
(947
)
 
182

 
(765
)
Net gain arising during the period
 
1,063

 
(316
)
 
747

Unrealized pension and postretirement benefits, net
 
116

 
(134
)
 
(18
)
Other comprehensive income (loss)
 
$
(1,772,993
)
 
$
348,698

 
$
(1,424,295
)
For the year ended December 31, 2017:
 
 
Before-Tax Amount
 
Tax (Expense) Benefit
 
After-Tax Amount
Foreign currency translation adjustments:
 
 
 
 
 
 
Change arising during year
 
$
74,926

 
$
25,369

 
$
100,295

Foreign currency swap
 
(47,953
)
 
16,784

 
(31,169
)
Net foreign currency translation adjustments
 
26,973

 
42,153

 
69,126

Unrealized gains on investments:(1)
 
 
 
 
 
 
Unrealized net holding gains arising during the year
 
1,029,591

 
(313,729
)
 
715,862

Less: Reclassification adjustment for net gains realized in net income
 
25,039

 
(7,011
)
 
18,028

Net unrealized gains
 
1,004,552

 
(306,718
)
 
697,834

Change in unrealized OTTI on fixed maturity securities
 
375

 
(131
)
 
244

Unrealized pension and postretirement benefits:
 
 
 
 
 
 
Net prior service cost arising during the year
 
11,717

 
(4,095
)
 
7,622

Net gain arising during the period
 
(10,587
)
 
3,691

 
(6,896
)
Unrealized pension and postretirement benefits, net
 
1,130

 
(404
)
 
726

Other comprehensive income (loss)
 
$
1,033,030

 
$
(265,100
)
 
$
767,930

For the year ended December 31, 2016:
 
 
Before-Tax Amount
 
Tax (Expense) Benefit
 
After-Tax Amount
Foreign currency translation adjustments:
 
 
 
 
 
 
Change arising during year
 
$
39,925

 
$
(24,663
)
 
$
15,262

Foreign currency swap
 
(10,234
)
 
3,582

 
(6,652
)
Net foreign currency translation adjustments
 
29,691

 
(21,081
)
 
8,610

Unrealized gains on investments:(1)
 
 
 
 
 
 
Unrealized net holding gains arising during the year
 
641,606

 
(180,448
)
 
461,158

Less: Reclassification adjustment for net gains realized in net income
 
65,798

 
(23,029
)
 
42,769

Net unrealized gains
 
575,808

 
(157,419
)
 
418,389

Change in unrealized OTTI on fixed maturity securities
 
1,457

 
(510
)
 
947

Unrealized pension and postretirement benefits:
 
 
 
 
 
 
Net prior service cost arising during the year
 
444

 
(149
)
 
295

Net gain arising during the period
 
4,427

 
(1,623
)
 
2,804

Unrealized pension and postretirement benefits, net
 
4,871

 
(1,772
)
 
3,099

Other comprehensive income (loss)
 
$
611,827

 
$
(180,782
)
 
$
431,045

(1)
Includes cash flow hedges. See Note 5 for additional information on cash flow hedges.
Components Of Accumulated Other Comprehensive Income [Table Text Block]
A summary of the components of net unrealized appreciation (depreciation) of balances carried at fair value is as follows (dollars in thousands):
For the years ended December 31,
 
2018
 
2017
 
2016
Change in net unrealized appreciation (depreciation) on:
 
 
 
 
 
 
Fixed maturity securities available-for-sale
 
$
(1,759,230
)
 
$
987,570

 
$
561,906

Other investments(1)
 
20,187

 
25,577

 
18,900

Effect on unrealized appreciation on:
 
 
 
 
 
 
Deferred policy acquisition costs
 
26,608

 
(8,220
)
 
(3,541
)
Net unrealized appreciation (depreciation)
 
$
(1,712,435
)
 
$
1,004,927

 
$
577,265

(1)
Includes cash flow hedges. See Note 5 for additional information on cash flow hedges.
Schedule of Accumulated Other Comprehensive Income (Loss) [Table Text Block]
The balance of and changes in each component of AOCI were as follows (dollars in thousands):
 
 
 
Accumulated
Currency
Translation
Adjustments
 
Unrealized Appreciation (Depreciation) of Investments (1)
 
Pension and
Postretirement
Benefits
 
Accumulated
Other
Comprehensive
Income (Loss)
Balance, December 31, 2015
 
$
(181,151
)
 
$
935,697

 
$
(46,262
)
 
$
708,284

OCI before reclassifications
 
29,691

 
646,887

 
(951
)
 
675,627

Amounts reclassified from AOCI
 
—

 
(69,622
)
 
5,822

 
(63,800
)
Deferred income tax benefit (expense)
 
(21,081
)
 
(157,929
)
 
(1,772
)
 
(180,782
)
Balance, December 31, 2016
 
(172,541
)
 
1,355,033


(43,163
)
 
1,139,329

OCI before reclassifications
 
26,973

 
1,039,387

 
(4,273
)
 
1,062,087

Amounts reclassified from AOCI
 
—

 
(34,460
)
 
5,403

 
(29,057
)
Deferred income tax benefit (expense)
 
42,153

 
(306,849
)
 
(404
)
 
(265,100
)
Adoption of new accounting standard
 
17,065

 
147,550

 
(8,243
)
 
156,372

Balance, December 31, 2017
 
(86,350
)
 
2,200,661

 
(50,680
)
 
2,063,631

OCI before reclassifications
 
(60,674
)
 
(1,860,789
)
 
(5,218
)
 
(1,926,681
)
Amounts reclassified from AOCI
 
—

 
148,354

 
5,334

 
153,688

Deferred income tax benefit (expense)
 
(19,101
)
 
367,933

 
(134
)
 
348,698

Adoption of new accounting standard
 
(2,573
)
 
—

 
—

 
(2,573
)
Balance, December 31, 2018
 
$
(168,698
)
 
$
856,159

 
$
(50,698
)
 
$
636,763

(1)
Includes cash flow hedges of $8,788, $2,619 and $(2,496) as of December 31, 2018, 2017 and 2016, respectively. See Note 5 for additional information on cash flow hedges.
Reclassification out of Accumulated Other Comprehensive Income [Table Text Block]
The following table presents the amounts of AOCI reclassifications for the years ended December 31, 2018 and 2017 (dollars in thousands):
 
 
Amount Reclassified from AOCI
 
 
Details about AOCI Components
 
2018
 
2017
 
Affected Line Item in 
Statement of Income
Net unrealized investment gains (losses):
 
 
 
 
 
 
Net unrealized gains and losses on available-for-sale securities
 
$
(122,221
)
 
$
25,039

 
Investment related gains (losses), net
Cash flow hedges - Interest rate
 
183

 
(79
)
 
(1)
Cash flow hedges - Currency/Interest rate
 
292

 
380

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

 
900

 
(1)
Deferred policy acquisition costs attributed to unrealized gains and losses
 
(26,608
)
 
8,220

 
(2)
Total
 
(148,354
)
 
34,460

 
 
Provision for income taxes
 
31,208

 
(10,308
)
 
 
Net unrealized gains (losses), net of tax
 
$
(117,146
)
 
$
24,152

 
 
 
 
 
 
 
 
 
Amortization of defined benefit plan items:
 
 
 
 
 
 
Prior service cost (credit)
 
$
971

 
$
971

 
(3)
Actuarial gains/(losses)
 
(6,305
)
 
(6,374
)
 
(3)
Total
 
(5,334
)
 
(5,403
)
 
 
Provision for income taxes
 
1,176

 
1,891

 
 
Amortization of defined benefit plans, net of tax
 
$
(4,158
)
 
$
(3,512
)
 
 
 
 
 
 
 
 
 
Total reclassifications for the period
 
$
(121,304
)
 
$
20,640

 
 
(1)
See Note 5 for information on cash flow hedges.
(2)
See Note 8 for information on deferred policy acquisition costs.
(3)
See Note 10 for information on employee benefit plans.