Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Investments
Fixed maturity securities - available for sale, at fair value (amortized cost: 2013 - $6,059,853 and 2012 - $5,856,432)	$ 6,194,625	$ 6,281,781
Equity securities - available for sale, at fair value (cost: 2013 - $395,018 and 2012 - $275,827)	433,345	284,639
Short-term investments, at cost (approximates fair value)	229,191	363,053
Other investments, at fair value (cost: 2012 - $18,391)	0	20,925
Total investments	6,857,161	6,950,398
Cash	55,037	71,390
Restricted cash and securities	121,231	101,480
Premium, claims and other receivables	600,311	549,725
Reinsurance recoverables	1,215,577	1,071,222
Ceded unearned premium	301,891	256,988
Ceded life and annuity benefits	57,137	58,641
Deferred policy acquisition costs	204,740	191,960
Goodwill	894,851	885,860
Other assets	140,843	130,143
Total assets	10,448,779	10,267,807
LIABILITIES
Loss and loss adjustment expense payable	4,021,847	3,767,850
Life and annuity policy benefits	57,137	58,641
Reinsurance, premium and claims payable	315,638	294,621
Unearned premium	1,165,580	1,069,956
Deferred ceding commissions	86,804	74,609
Notes payable	654,059	583,944
Accounts payable and accrued liabilities	559,635	875,574
Total liabilities	6,860,700	6,725,195
SHAREHOLDERS' EQUITY
Common stock, $1.00 par value; 250,000 shares authorized (shares issued: 2013 - 125,423 and 2012 - 125,114; outstanding: 2013 - 100,182 and 2012 - 100,928)	125,423	125,114
Additional paid-in capital	1,068,338	1,052,253
Retained earnings	2,992,720	2,756,166
Accumulated other comprehensive income	130,002	295,271
Treasury stock, at cost (shares: 2013 - 25,241 and 2012 - 24,186)	(728,404)	(686,192)
Total shareholders' equity	3,588,079	3,542,612
Total liabilities and shareholders' equity	$ 10,448,779	$ 10,267,807