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Accumulated Other Comprehensive Income (Balance of and Changes in Each Component of AOCI) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | Jun. 30, 2015 | Jun. 30, 2014
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), before Tax |  |  |  | $ (700,801) | $ 940,231
Other Comprehensive Income (Loss), Tax |  |  |  | 197,414 | (293,500)
Net income |  | $ 130,391 | $ 198,296 | 255,505 | 334,960
Balance, Beginning of Period |  |  |  | 1,657,129 | 1,005,607
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest |  | 213,790 | 300,535 | 397,915 | 499,975
Balance, End of Period |  | 1,149,364 | 1,628,660 | 1,149,364 | 1,628,660
Provision for income taxes |  | (83,399) | (102,239) | (142,410) | (165,015)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  |  |  | (503,387) | 646,731
Accumulated Translation Adjustment [Member] |  |  |  |  |
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax |  |  |  | (89,220) | (9,162)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax |  |  |  | (6,616) | 9,122
Net income |  |  |  | 0 | 0
Balance, Beginning of Period |  |  |  | 81,847 | 207,083
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest |  |  |  | 0 | 0
Balance, End of Period |  | (13,989) | 207,043 | (13,989) | 207,043
Provision for income taxes |  |  |  | 0 | 0
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  |  |  | (95,836) | (40)
Accumulated Net Unrealized Investment Gain (Loss) [Member] |  |  |  |  |
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items] |  |  |  |  |
Other Comprehensive Income (Loss), Available-for-sale Securities Adjustment, before Reclassification Adjustments and Tax | [1] |  |  | (612,314) | 949,650
Other Comprehensive Income (Loss), Available-for-sale Securities, before Reclassification Adjustments, Tax | [1] |  |  | 204,252 | (302,873)
Net income | [1] |  |  | (5,655) | (24,698)
Balance, Beginning of Period | [1] |  |  | 1,624,773 | 820,245
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest | [1] |  |  | (6,192) | (37,661)
Balance, End of Period | [1] | 1,211,056 | 1,442,324 | 1,211,056 | 1,442,324
Provision for income taxes | [1] |  |  | 537 | 12,963
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax | [1] |  |  | (408,062) | 646,777
Accumulated Defined Benefit Plans Adjustment [Member] |  |  |  |  |
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items] |  |  |  |  |
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, before Tax |  |  |  | 733 | (257)
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Tax |  |  |  | (222) | 251
Net income |  |  |  | 1,277 | 1,020
Balance, Beginning of Period |  |  |  | (49,491) | (21,721)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest |  |  |  | 1,965 | 1,570
Balance, End of Period |  | $ (47,703) | $ (20,707) | (47,703) | (20,707)
Provision for income taxes |  |  |  | (688) | (550)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax |  |  |  | 511 | (6)
Amounts Reclassified From AOCI [Member] |  |  |  |  |
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items] |  |  |  |  |
Net income |  |  |  | (4,378) | (23,678)
Income (Loss) from Continuing Operations before Equity Method Investments, Income Taxes, Extraordinary Items, Noncontrolling Interest |  |  |  | (4,227) | (36,091)
Provision for income taxes |  |  |  | $ (151) | $ 12,413
[1] | Includes cash flow hedges. See Note 5 - “Derivative Instruments” for additional information on cash flow hedges.

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