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Investments (Details 3) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Unrealized gains and losses on fixed maturities and equity securities
Amortized Cost or Cost	$ 5,311,457	$ 4,984,389
Unrealized Gains	660,665	470,496
Unrealized Losses	9,890	33,053
Fair value of issued securities	5,962,232	5,421,832
OTTI in AOCI	3,214	2,136
Equity securities, Amortized Cost or Cost	52,396	23,070
Equity securities, Fair Value	53,503	26,774
Mortgage-backed securities [Member]
Unrealized gains and losses on fixed maturities and equity securities
Amortized Cost or Cost	547,040	532,554
Unrealized Gains	72,644	71,402
Unrealized Losses	125	144
Fair value of issued securities	619,559	603,812
Other including U.S. Treasury Securities [Member]
Unrealized gains and losses on fixed maturities and equity securities
Amortized Cost or Cost	371,706	560,036
Unrealized Gains	37,857	43,705
Unrealized Losses	135
Fair value of issued securities	409,428	603,741
Municipal Bonds [Member]
Unrealized gains and losses on fixed maturities and equity securities
Amortized Cost or Cost	1,402,424	1,291,281
Unrealized Gains	186,261	122,857
Unrealized Losses	2,648	1,020
Fair value of issued securities	1,586,037	1,413,118
Foreign government bonds [Member]
Unrealized gains and losses on fixed maturities and equity securities
Amortized Cost or Cost	48,476	44,529
Unrealized Gains	9,393	5,095
Fair value of issued securities	57,869	49,624
Corporate Bonds [Member]
Unrealized gains and losses on fixed maturities and equity securities
Amortized Cost or Cost	2,258,554	1,967,229
Unrealized Gains	313,430	205,413
Unrealized Losses	4,950	16,098
Fair value of issued securities	2,567,034	2,156,544
Other Mortgage-backed Securities [Member]
Unrealized gains and losses on fixed maturities and equity securities
Amortized Cost or Cost	683,257	588,760
Unrealized Gains	41,080	22,024
Unrealized Losses	2,032	15,791
Fair value of issued securities	722,305	594,993
OTTI in AOCI	3,214	2,136
Equity Securities [Member]
Unrealized gains and losses on fixed maturities and equity securities
Unrealized Gains	2,397	4,030
Unrealized Losses	1,290	326
Equity securities, Amortized Cost or Cost	52,396	23,070
Equity securities, Fair Value	$ 53,503	$ 26,774

X

- Definition

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