Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Investments
Fixed maturity securities - available for sale, at fair value (amortized cost: 2013 - $5,943,160 and 2012 - $5,856,432)	$ 6,094,640	$ 6,281,781
Equity securities - available for sale, at fair value (cost: 2013 - $323,249 and 2012 - $275,827)	347,840	284,639
Short-term investments, at cost (approximates fair value)	216,793	363,053
Other investments, at fair value (cost: 2013 - $16 and 2012 - $18,391)	18	20,925
Total investments	6,659,291	6,950,398
Cash	39,353	71,390
Restricted cash and securities	115,031	101,480
Premium, claims and other receivables	648,438	549,725
Reinsurance recoverables	1,086,435	1,071,222
Ceded unearned premium	291,939	256,988
Ceded life and annuity benefits	57,841	58,641
Deferred policy acquisition costs	202,322	191,960
Goodwill	885,999	885,860
Other assets	166,845	130,143
Total assets	10,153,494	10,267,807
LIABILITIES
Loss and loss adjustment expense payable	3,814,684	3,767,850
Life and annuity policy benefits	57,841	58,641
Reinsurance, premium and claims payable	337,666	294,621
Unearned premium	1,189,520	1,069,956
Deferred ceding commissions	82,119	74,609
Notes payable	639,021	583,944
Accounts payable and accrued liabilities	527,260	875,574
Total liabilities	6,648,111	6,725,195
SHAREHOLDERS' EQUITY
Common stock, $1.00 par value; 250,000 shares authorized (shares issued: 2013 - 125,350 and 2012 - 125,114; outstanding: 2013 - 100,140 and 2012 - 100,928)	125,350	125,114
Additional paid-in capital	1,063,949	1,052,253
Retained earnings	2,917,086	2,756,166
Accumulated other comprehensive income	126,119	295,271
Treasury stock, at cost (shares: 2013 - 25,210 and 2012 - 24,186)	(727,121)	(686,192)
Total shareholders' equity	3,505,383	3,542,612
Total liabilities and shareholders' equity	$ 10,153,494	$ 10,267,807