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Investments (Schedule Of Changes In Assets Measured At Fair Value On A Recurring Basis Using Significant Unobservable Inputs (Level 3)) (Detail) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Investment [Line Items]      
Balance at January 1 $ 104,841 $ 103,618 $ 203,362
Included in realized gains/losses (12,542) 500 (85,960)
Included in other comprehensive income 17,856 16,877 79,675
Sales (13,875) (8,193) (6,708)
Amortization 3,566 4,674 3,192
Other 1,442 [1] 1,353 [1] 5,885 [1]
Transfers in to Level 3     53,430
Transfers out of Level 3 (51,886) (13,988) (149,258)
Balance at December 31 49,402 104,841 103,618
Asset-backed Securities [Member]
     
Investment [Line Items]      
Balance at January 1 8,042 7,981 23,077
Included in realized gains/losses 0 0 0
Included in other comprehensive income (714) 255 1,717
Sales 0 0 0
Amortization (206) (194) (183)
Other 0 [1] 0 [1] 0 [1]
Transfers in to Level 3     0
Transfers out of Level 3 0 0 (16,630)
Balance at December 31 7,122 8,042 7,981
Collateralized Debt Obligations [Member]
     
Investment [Line Items]      
Balance at January 1 22,456 18,037 14,158
Included in realized gains/losses 0 (1,712) (83,458)
Included in other comprehensive income 3,952 2,445 80,674
Sales 0 0 125
Amortization 2,470 2,333 1,014
Other 1,442 [1] 1,353 [1] 5,524 [1]
Transfers in to Level 3     0
Transfers out of Level 3 0 0 0
Balance at December 31 30,320 22,456 18,037
Corporates [Member]
     
Investment [Line Items]      
Balance at January 1 73,673 [2] 71,764 [2] 164,881 [2]
Included in realized gains/losses (12,542) [2] 1,504 [2] (2,502) [2]
Included in other comprehensive income 14,578 [2] 14,711 [2] (2,728) [2]
Sales (13,875) [2] (5,862) [2] (6,833) [2]
Amortization 1,302 [2] 2,536 [2] 2,366 [2]
Other 0 [1],[2] 0 [1],[2] 213 [1],[2]
Transfers in to Level 3     48,995 [2]
Transfers out of Level 3 (51,886) [2] (10,980) [2] (132,628) [2]
Balance at December 31 11,250 [2] 73,673 [2] 71,764 [2]
Other [Member]
     
Investment [Line Items]      
Balance at January 1 670 5,836 1,246
Included in realized gains/losses 0 708 0
Included in other comprehensive income 40 (534) 12
Sales 0 (2,331) 0
Amortization 0 (1) (5)
Other 0 [1] 0 [1] 148 [1]
Transfers in to Level 3     4,435
Transfers out of Level 3 0 (3,008) 0
Balance at December 31 $ 710 $ 670 $ 5,836
[1] Includes capitalized interest and foreign exchange adjustments.
[2] Includes redeemable preferred stocks