Consolidated Statements Of Income And Comprehensive Income (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
OPERATING REVENUES
Earned premiums	$ 529,596	$ 463,111
Net investment income	79,794	70,099
Net realized investment gains	11,909	11,240
Other revenues	111,836	77,144
Total Operating Revenues	733,135	621,594
OPERATING EXPENSES
Losses and loss adjustment expenses	288,521	314,328
Underwriting, acquisition and insurance expenses	238,697	202,350
Amortization of intangible assets	8,804	6,008
Other expenses	100,404	68,495
Total Operating Expenses	636,426	591,181
Operating Income	96,709	30,413
Interest expense	22,167	18,962
Income Before Income Taxes	74,542	11,451
Income tax expense	16,829	1,590
Net Income	57,713	9,861
Net income attributable to noncontrolling interests	460	1,589
Net Income to Shareholders	57,253	8,272
OTHER COMPREHENSIVE INCOME
Net holding gains arising during the period	153,455	20,321
Unrealized other-than-temporary impairment losses on fixed maturities arising during the period	(138)	(176)
Reclassification adjustments for net gains included in net income	(7,931)	(6,464)
Change in net unrealized gains on investments, net of taxes	145,386	13,681
Change in foreign currency translation adjustments, net of taxes	2,823	2,439
Change in net actuarial pension loss, net of taxes	483	346
Total Other Comprehensive Income	148,692	16,466
Comprehensive Income	206,405	26,327
Comprehensive income attributable to noncontrolling interests	460	1,589
Comprehensive Income to Shareholders	$ 205,945	$ 24,738
NET INCOME PER SHARE
Basic (in dollars per share)	$ 5.94	$ 0.85
Diluted (in dollars per share)	$ 5.92	$ 0.85