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Investments (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012
Unrealized gains and losses on fixed maturities and equity securities
Amortized Cost/Cost	$ 5,509,859	$ 5,311,457
Unrealized Gains	645,709	660,665
Unrealized Losses	11,895	9,890
Fair value of issued securities	6,143,673	5,962,232
OTTI in AOCI	2,880	3,214
Equity securities, Amortized Cost/Cost	53,117	52,396
Equity securities, Fair Value	58,661	53,503
Mortgage-backed securities [Member]
Unrealized gains and losses on fixed maturities and equity securities
Amortized Cost/Cost	562,657	547,040
Unrealized Gains	69,206	72,644
Unrealized Losses	439	125
Fair value of issued securities	631,424	619,559
Other, including U.S. Treasury Securities [Member]
Unrealized gains and losses on fixed maturities and equity securities
Amortized Cost/Cost	415,050	371,706
Unrealized Gains	34,127	37,857
Unrealized Losses	658	135
Fair value of issued securities	448,519	409,428
Municipal bonds [Member]
Unrealized gains and losses on fixed maturities and equity securities
Amortized Cost/Cost	1,422,405	1,402,424
Unrealized Gains	185,899	186,261
Unrealized Losses	4,062	2,648
Fair value of issued securities	1,604,242	1,586,037
Foreign government bonds [Member]
Unrealized gains and losses on fixed maturities and equity securities
Amortized Cost/Cost	50,445	48,476
Unrealized Gains	8,915	9,393
Unrealized Losses	17
Fair value of issued securities	59,343	57,869
Corporate bonds [Member]
Unrealized gains and losses on fixed maturities and equity securities
Amortized Cost/Cost	2,347,748	2,258,554
Unrealized Gains	305,976	313,430
Unrealized Losses	4,204	4,950
Fair value of issued securities	2,649,520	2,567,034
Other mortgage-backed securities [Member]
Unrealized gains and losses on fixed maturities and equity securities
Amortized Cost/Cost	711,554	683,257
Unrealized Gains	41,586	41,080
Unrealized Losses	2,515	2,032
Fair value of issued securities	750,625	722,305
OTTI in AOCI	2,880	3,214
Equity securities [Member]
Unrealized gains and losses on fixed maturities and equity securities
Unrealized Gains	6,251	2,397
Unrealized Losses	707	1,290
Equity securities, Amortized Cost/Cost	53,117	52,396
Equity securities, Fair Value	$ 58,661	$ 53,503

X

- Definition

This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

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Amount of debt securities categorized neither as held-to-maturity nor trading.

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