Investment Information (Details - Maturity Profile of Available For Sale Securities) (USD $) In Thousands	Sep. 30, 2011	Dec. 31, 2010
Estimated Fair Value:
Due in one year or less	$ 424,945	$ 414,390
Due after one year through five years	2,950,545	2,924,879
Due after five years through 10 years	2,446,160	1,719,446
Due after 10 years	468,652	442,575
Subtotal	6,290,302	5,501,290
Estimated fair value	10,905,082	10,535,007
Amortized Cost:
Due in one year or less	413,387	398,795
Due after one year through five years	2,869,718	2,833,955
Due after five years through 10 years	2,376,760	1,671,306
Due after 10 years	448,401	442,626
Subtotal	6,108,266	5,346,682
Amortized cost	10,709,392	10,303,557
Fixed maturities fair value [Member]
Estimated Fair Value:
Estimated fair value	9,602,233	9,033,434
Amortized Cost:
Amortized cost	9,375,096	8,844,521
Fixed maturities fair value [Member] | Mortgage backed securities [Member]
Estimated Fair Value:
Estimated fair value	1,545,321	1,806,813
Amortized Cost:
Amortized cost	1,533,928	1,814,905
Fixed maturities fair value [Member] | Commercial mortgage backed securities [Member]
Estimated Fair Value:
Estimated fair value	1,118,905	1,167,299
Amortized Cost:
Amortized cost	1,096,154	1,141,584
Fixed maturities fair value [Member] | Asset backed securities [Member]
Estimated Fair Value:
Estimated fair value	647,705	558,032
Amortized Cost:
Amortized cost	$ 636,748	$ 541,350