CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Investments:
Fixed maturities available for sale, at fair value (amortized cost: $9,567,290 and $9,165,438)	$ 9,839,988	$ 9,375,604
Short-term investments available for sale, at fair value (amortized cost: $719,848 and $909,121)	722,121	904,219
Investment of funds received under securities lending, at fair value (amortized cost: $42,302 and $48,577)	42,531	48,419
Equity securities available for sale, at fair value (cost: $298,414 and $299,058)	312,749	299,584
Other investments available for sale, at fair value (cost: $519,955 and $235,381)	549,280	238,111
Investments accounted for using the fair value option	917,466	366,903
TALF investments, at fair value (2011 amortized cost: $373,040)	0	387,702
Investments accounted for using the equity method	307,105	380,507
Total investments	12,691,240	12,001,049
Cash	371,041	351,699
Accrued investment income	71,748	70,739
Investment in joint venture (cost: $100,000)	107,284	107,576
Fixed maturities and short-term investments pledged under securities lending, at fair value	50,848	56,393
Premiums receivable	688,873	501,563
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses	1,870,037	1,851,584
Contractholder receivables	865,728	748,231
Prepaid reinsurance premiums	298,484	265,696
Deferred acquisition costs, net	262,822	227,884
Receivable for securities sold	19,248	462,891
Other assets	519,409	460,052
Total Assets	17,816,762	17,105,357
Liabilities
Reserve for losses and loss adjustment expenses	8,933,292	8,456,210
Unearned premiums	1,647,978	1,411,872
Reinsurance balances payable	188,546	133,866
Contractholder payables	865,728	748,231
Senior notes	300,000	300,000
Revolving credit agreement borrowings	100,000	100,000
TALF borrowings, at fair value (2011 par: $310,868)	0	310,486
Securities lending payable	52,356	58,546
Payable for securities purchased	37,788	480,230
Other liabilities	522,196	513,842
Total Liabilities	12,647,884	12,513,283
Commitments and Contingencies
Shareholders' Equity
Non-cumulative preferred shares	325,000	325,000
Common shares ($0.0033 par, shares issued: 168,255,572 and 164,636,338)	561	549
Additional paid-in capital	227,778	161,419
Retained earnings	5,354,361	4,796,655
Accumulated other comprehensive income, net of deferred income tax	287,017	153,923
Common shares held in treasury, at cost (shares: 34,412,959 and 30,277,993)	(1,025,839)	(845,472)
Total Shareholders Equity	5,168,878	4,592,074
Total Liabilities and Shareholders Equity	$ 17,816,762	$ 17,105,357