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Comprehensive Income (Details) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax [Abstract]      
Change in foreign currency translation adjustments $ 37,680,000 $ (25,500,000) $ 51,320,000
Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax [Abstract]      
Change in unrealized gain (loss) on securities 451,905,000 769,105,000 542,911,000
Change in other-than-temporary impairment losses recognized in other comprehensive income 6,434,000 (1,236,000) 4,081,000
Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Of Tax [Abstract]      
Changes in pension and other postretirement plan adjustments (5,270,000) (16,400,000) 1,566,000
Total other comprehensive income (loss) 490,749,000 725,969,000 599,878,000
Before Tax Amount [Member]
      
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax [Abstract]      
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Change Arising During Year 57,229,000 (28,779,000) 72,989,000
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap (20,470,000) 4,858,000 (41,302,000)
Change in foreign currency translation adjustments 36,759,000 (23,921,000) 31,687,000
Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax [Abstract]      
Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Unrealized Net Holding Gains Arising During The Year 786,449,000 1,118,586,000 849,226,000
Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Reclassification Adjustment For Net Gains Realized 91,327,000 72,841,000 41,069,000
Change in unrealized gain (loss) on securities 695,122,000 1,045,745,000 808,157,000
Change in other-than-temporary impairment losses recognized in other comprehensive income 9,899,000 (1,901,000) 6,279,000
Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Of Tax [Abstract]      
Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Prior Service Cost Arising During The Year 298,000 460,000 (321,000)
Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Gain Arising During The Period (8,347,000) (25,441,000) 2,798,000
Changes in pension and other postretirement plan adjustments (8,049,000) (24,981,000) 2,477,000
Total other comprehensive income (loss) 733,731,000 994,942,000 848,600,000
Tax Expense Benefit [Member]
      
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax [Abstract]      
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Change Arising During Year (6,244,000) 121,000 5,177,000
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap 7,165,000 (1,700,000) 14,456,000
Change in foreign currency translation adjustments 921,000 (1,579,000) 19,633,000
Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax [Abstract]      
Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Unrealized Net Holding Gains Arising During The Year (275,181,000) (302,134,000) (279,620,000)
Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Reclassification Adjustment For Net Gains Realized (31,964,000) (25,494,000) (14,374,000)
Change in unrealized gain (loss) on securities (243,217,000) (276,640,000) (265,246,000)
Change in other-than-temporary impairment losses recognized in other comprehensive income (3,465,000) 665,000 (2,198,000)
Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Of Tax [Abstract]      
Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Prior Service Cost Arising During The Year (95,000) (185,000) 108,000
Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Gain Arising During The Period 2,874,000 8,766,000 (1,019,000)
Changes in pension and other postretirement plan adjustments 2,779,000 8,581,000 (911,000)
Total other comprehensive income (loss) (242,982,000) (268,973,000) (248,722,000)
After Tax Amount [Member]
      
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Net Of Tax [Abstract]      
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Change Arising During Year 50,985,000 (28,658,000) 78,166,000
Other Comprehensive Income Foreign Currency Transaction And Translation Gain Loss Arising During Period Foreign Currency Swap (13,305,000) 3,158,000 (26,846,000)
Change in foreign currency translation adjustments 37,680,000 (25,500,000) 51,320,000
Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Net Of Tax [Abstract]      
Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Unrealized Net Holding Gains Arising During The Year 511,268,000 816,452,000 569,606,000
Other Comprehensive Income Unrealized Holding Gain Loss On Securities Arising During Period Reclassification Adjustment For Net Gains Realized 59,363,000 47,347,000 26,695,000
Change in unrealized gain (loss) on securities 451,905,000 769,105,000 542,911,000
Change in other-than-temporary impairment losses recognized in other comprehensive income 6,434,000 (1,236,000) 4,081,000
Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Of Tax [Abstract]      
Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Prior Service Cost Arising During The Year 203,000 275,000 (213,000)
Other Comprehensive Income Amortization Of Defined Benefit Plan Net Prior Service Cost Recognized In Net Periodic Pension Cost Net Gain Arising During The Period (5,473,000) (16,675,000) 1,779,000
Changes in pension and other postretirement plan adjustments (5,270,000) (16,400,000) 1,566,000
Total other comprehensive income (loss) $ 490,749,000 $ 725,969,000 $ 599,878,000