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INVESTMENT OPERATIONS (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Amortized cost and fair value of the Company's investments classified as available-for-sale    
Amortized Cost $ 31,535,388 $ 24,104,126
Gross Unrealized Gains 1,729,974 3,251,213
Gross Unrealized Losses (604,304) (140,657)
Fair Value 32,661,058 27,214,682
Total OTTI Recognized in OCI 928 (6,135)
Amortized cost and fair value of the Company's investments classified as held-to-maturity    
Fair Value 335,676 319,163
Trading securities 2,800,000  
Amortized Cost, Held-to-maturity    
Total 365,000 300,000
Fair Value, Held-to-maturity    
Fair Value 335,676 319,163
Fixed maturities:
   
Amortized cost and fair value of the Company's investments classified as available-for-sale    
Amortized Cost 30,843,333 23,654,002
Gross Unrealized Gains 1,723,906 3,239,332
Gross Unrealized Losses (567,972) (130,664)
Fair Value 31,999,267 26,762,670
Total OTTI Recognized in OCI 928 (6,135)
Amortized cost and fair value of the Company's investments classified as held-to-maturity    
Amortized Cost 365,000 300,000
Gross Unrealized Gains   19,163
Gross Unrealized Losses (29,324)  
Fair Value 335,676 319,163
Trading securities 2,800,000 3,000,000
Amortized Cost, Available-for-sale    
Due in one year or less 1,016,111  
Due after one year through five years 4,980,915  
Due after five years through ten years 9,074,051  
Due after ten years 15,772,256  
Total 30,843,333  
Fair Value, Available-for-sale    
Due in one year or less 1,033,834  
Due after one year through five years 5,244,978  
Due after five years through ten years 9,323,440  
Due after ten years 16,397,015  
Total 31,999,267  
Amortized Cost, Held-to-maturity    
Due after ten years 365,000  
Total 365,000 300,000
Fair Value, Held-to-maturity    
Due after ten years 335,676  
Fair Value 335,676 319,163
Residential mortgage-backed securities
   
Amortized cost and fair value of the Company's investments classified as available-for-sale    
Amortized Cost 1,435,349 1,766,260
Gross Unrealized Gains 34,255 92,417
Gross Unrealized Losses (24,536) (19,347)
Fair Value 1,445,068 1,839,330
Total OTTI Recognized in OCI 979 (406)
Commercial mortgage-backed securities
   
Amortized cost and fair value of the Company's investments classified as available-for-sale    
Amortized Cost 963,461 797,844
Gross Unrealized Gains 26,900 72,577
Gross Unrealized Losses (19,705) (598)
Fair Value 970,656 869,823
Other asset-backed securities
   
Amortized cost and fair value of the Company's investments classified as available-for-sale    
Amortized Cost 926,396 1,023,649
Gross Unrealized Gains 15,135 12,788
Gross Unrealized Losses (69,548) (61,424)
Fair Value 871,983 975,013
Total OTTI Recognized in OCI (51) (241)
U.S. government-related securities
   
Amortized cost and fair value of the Company's investments classified as available-for-sale    
Amortized Cost 1,529,818 1,097,501
Gross Unrealized Gains 32,150 71,536
Gross Unrealized Losses (54,078) (591)
Fair Value 1,507,890 1,168,446
Other government-related securities
   
Amortized cost and fair value of the Company's investments classified as available-for-sale    
Amortized Cost 49,171 93,565
Gross Unrealized Gains 2,257 7,258
Gross Unrealized Losses (1) (45)
Fair Value 51,427 100,778
States, municipals, and political subdivisions
   
Amortized cost and fair value of the Company's investments classified as available-for-sale    
Amortized Cost 1,315,457 1,188,019
Gross Unrealized Gains 103,663 255,898
Gross Unrealized Losses (8,291) (264)
Fair Value 1,410,829 1,443,653
Corporate bonds
   
Amortized cost and fair value of the Company's investments classified as available-for-sale    
Amortized Cost 24,623,681 17,687,164
Gross Unrealized Gains 1,509,546 2,726,858
Gross Unrealized Losses (391,813) (48,395)
Fair Value 25,741,414 20,365,627
Total OTTI Recognized in OCI   (5,488)
Other
   
Amortized cost and fair value of the Company's investments classified as held-to-maturity    
Amortized Cost 365,000 300,000
Gross Unrealized Gains   19,163
Gross Unrealized Losses (29,324)  
Fair Value 335,676 319,163
Fair Value, Held-to-maturity    
Fair Value 335,676 319,163
Equity securities
   
Amortized cost and fair value of the Company's investments classified as available-for-sale    
Amortized Cost 611,473 352,272
Gross Unrealized Gains 6,068 11,881
Gross Unrealized Losses (36,332) (9,993)
Fair Value 581,209 354,160
Amortized cost and fair value of the Company's investments classified as held-to-maturity    
Trading securities 21,200 19,600
Short-term investments
   
Amortized cost and fair value of the Company's investments classified as available-for-sale    
Amortized Cost 80,582 97,852
Fair Value 80,582 97,852
Amortized cost and fair value of the Company's investments classified as held-to-maturity    
Trading securities $ 52,400 $ 118,900