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Consolidated Statements Of Shareholders' Equity (USD $) In Thousands, except Share data, unless otherwise specified | Total | Common Stock [Member] | Additional Paid-In Capital [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Income (Loss) [Member] | Treasury Balance [Member]
--- | --- | --- | --- | --- | --- | ---
Beginning Balance at Dec. 31, 2011 | $ 2,420,256 us-gaap_StockholdersEquity | $ 3,391 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 968,392 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 6,824,180 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (476,733)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (4,898,974)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Beginning Balance, shares at Dec. 31, 2011 |  | 339,107,230 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 623,925 us-gaap_NetIncomeLoss |  |  | 623,925 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Total other comprehensive loss, net of tax (Note 10) | (130,945)us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  | (130,945)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Dividends | (141,681)us-gaap_DividendsCash |  |  | (141,681)us-gaap_DividendsCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Repurchase of common stock | (311,632)us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |  | (311,632)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Share-based compensation and 401(k) match made with Treasury shares | 42,058 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued |  | 42,056 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 2 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Issuance of nonvested stock (in shares) |  | 535,807 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Issuance of nonvested stock |  | 6 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (6)us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Exercise of stock options | 45,973 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised | 16 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 45,957 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Exercise of stock options (in shares) |  | 1,622,801 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Tax benefit of stock options and nonvested stock | 9,670 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  | 9,670 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Ending Balance at Dec. 31, 2012 | 2,557,624 us-gaap_StockholdersEquity | 3,413 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,066,069 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 7,306,424 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (607,678)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (5,210,604)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Ending Balance, shares at Dec. 31, 2012 |  | 341,265,838 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 733,993 us-gaap_NetIncomeLoss |  |  | 733,993 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Total other comprehensive loss, net of tax (Note 10) | 275,002 us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  | 275,002 us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Dividends | (187,688)us-gaap_DividendsCash |  |  | (187,688)us-gaap_DividendsCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Repurchase of common stock | (479,231)us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |  | (479,231)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Share-based compensation and 401(k) match made with Treasury shares | 41,508 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued |  | 40,724 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 784 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Issuance of nonvested stock (in shares) |  | 492,755 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Issuance of nonvested stock |  | 5 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (5)us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Exercise of stock options | 50,567 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised | 14 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 50,553 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Exercise of stock options (in shares) |  | 1,398,638 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Tax benefit of stock options and nonvested stock | 17,711 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  | 17,711 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Ending Balance at Dec. 31, 2013 | 3,009,486 us-gaap_StockholdersEquity | 3,432 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1,175,052 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 7,852,729 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | (332,676)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | (5,689,051)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Ending Balance, shares at Dec. 31, 2013 |  | 343,157,231 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 844,611 us-gaap_NetIncomeLoss |  |  | 844,611 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Total other comprehensive loss, net of tax (Note 10) | (182,267)us-gaap_OtherComprehensiveIncomeLossNetOfTax |  |  |  | (182,267)us-gaap_OtherComprehensiveIncomeLossNetOfTax / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember |
Dividends | (238,300)us-gaap_DividendsCash |  |  | (238,300)us-gaap_DividendsCash / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember |  |
Repurchase of common stock | (615,602)us-gaap_TreasuryStockValueAcquiredCostMethod |  |  |  |  | (615,602)us-gaap_TreasuryStockValueAcquiredCostMethod / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Share-based compensation and 401(k) match made with Treasury shares | 41,991 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued |  | 40,848 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  | 1,143 us-gaap_StockIssuedDuringPeriodValueTreasuryStockReissued / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Issuance of nonvested stock (in shares) |  | 15,891 us-gaap_StockIssuedDuringPeriodSharesShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Issuance of nonvested stock |  | 0 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_StockIssuedDuringPeriodValueShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Exercise of stock options | 37,785 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised | 10 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 37,775 us-gaap_StockIssuedDuringPeriodValueStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Exercise of stock options (in shares) | 1,002,000 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised | 1,001,531 us-gaap_StockIssuedDuringPeriodSharesStockOptionsExercised / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |
Tax benefit of stock options and nonvested stock | 11,582 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation |  | 11,582 us-gaap_AdjustmentsToAdditionalPaidInCapitalTaxEffectFromShareBasedCompensation / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |  |  |
Ending Balance at Dec. 31, 2014 | $ 2,909,286 us-gaap_StockholdersEquity | $ 3,442 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 1,265,257 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ 8,459,040 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember | $ (514,943)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AccumulatedOtherComprehensiveIncomeMember | $ (6,303,510)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_TreasuryStockMember
Ending Balance, shares at Dec. 31, 2014 |  | 344,174,653 us-gaap_SharesIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |

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