Consolidated Statements Of Operations And Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
REVENUES:
Premiums earned	$ 521,424	$ 520,736	$ 1,042,486	$ 991,181
Net investment income	70,925	68,636	143,506	132,423
Net realized capital gains (losses):
Other-than-temporary impairments on fixed maturity securities	$ (8,810)	$ (199)	$ (32,931)	$ (199)
Other-than-temporary impairments on fixed maturity securities transferred to other comprehensive income (loss)
Other net realized capital gains (losses)	$ 60,035	$ 125,313	$ 105,452	$ 121,263
Total net realized capital gains (losses)	51,225	125,114	72,521	121,064
Other income (expense)	12,289	(8,782)	28,122	(11,837)
Total revenues	655,863	705,704	1,286,635	1,232,831
CLAIMS AND EXPENSES:
Incurred losses and loss adjustment expenses	322,879	321,517	631,759	599,563
Commission, brokerage, taxes and fees	72,953	85,322	169,484	161,416
Other underwriting expenses	51,573	47,158	100,116	86,409
Corporate expenses	1,785	(524)	3,394	778
Interest, fee and bond issue cost amortization expense	8,858	8,811	17,717	16,247
Total claims and expenses	458,048	462,284	922,470	864,413
INCOME (LOSS) BEFORE TAXES	197,815	243,420	364,165	368,418
Income tax expense (benefit)	64,049	85,246	114,455	123,778
NET INCOME (LOSS)	133,766	158,174	249,710	244,640
Other comprehensive income (loss), net of tax :
Unrealized appreciation (depreciation) ("URA(D)") on securities arising during the period	(35,938)	19,102	(19,988)	39,899
Less: reclassification adjustment for realized losses (gains) included in net income (loss)	13,661	857	37,326	2,155
Total URA(D) on securities arising during the period	(22,277)	19,959	17,338	42,054
Foreign currency translation adjustments	$ 16,145	$ 6,721	$ (17,163)	$ (1,115)
Benefit plan actuarial net gain (loss) for the period
Reclassification adjustment for amortization of net (gain) loss included in net income (loss)	$ 1,609	$ 770	$ 3,213	$ 1,541
Total benefit plan net gain (loss) for the period	1,609	770	3,213	1,541
Total other comprehensive income (loss), net of tax	(4,523)	27,450	3,388	42,480
COMPREHENSIVE INCOME (LOSS)	$ 129,243	$ 185,624	$ 253,098	$ 287,120