Consolidated Statements Of Operations And Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
REVENUES:
Premiums earned	$ 488,855	$ 521,424	$ 970,780	$ 1,042,486
Net investment income	73,872	70,925	132,317	143,506
Net realized capital gains (losses):
Other-than-temporary impairments on fixed maturity securities	(1,391)	(8,810)	(24,406)	(32,931)
Other-than-temporary impairments on fixed maturity securities transferred to other comprehensive income (loss)
Other net realized capital gains (losses)	30,556	60,035	(12,806)	105,452
Total net realized capital gains (losses)	29,165	51,225	(37,212)	72,521
Other income (expense)	(10,700)	12,289	2,402	28,122
Total revenues	581,192	655,863	1,068,287	1,286,635
CLAIMS AND EXPENSES:
Incurred losses and loss adjustment expenses	338,536	322,879	634,598	631,759
Commission, brokerage, taxes and fees	72,126	72,953	140,948	169,484
Other underwriting expenses	58,330	51,573	117,557	100,116
Corporate expenses	2,010	1,785	4,346	3,394
Interest, fee and bond issue cost amortization expense	8,858	8,858	17,717	17,717
Total claims and expenses	479,860	458,048	915,166	922,470
INCOME (LOSS) BEFORE TAXES	101,332	197,815	153,121	364,165
Income tax expense (benefit)	32,982	64,049	45,845	114,455
NET INCOME (LOSS)	68,350	133,766	107,276	249,710
Other comprehensive income (loss), net of tax :
Unrealized appreciation (depreciation) ("URA(D)") on securities arising during the period	39,264	(35,938)	58,864	(19,988)
Less: reclassification adjustment for realized losses (gains) included in net income (loss)	(63)	13,661	25,852	37,326
Total URA(D) on securities arising during the period	39,201	(22,277)	84,716	17,338
Foreign currency translation adjustments	15,489	16,145	30,421	(17,163)
Benefit plan actuarial net gain (loss) for the period
Reclassification adjustment for amortization of net (gain) loss included in net income (loss)	1,341	1,609	2,681	3,213
Total benefit plan net gain (loss) for the period	1,341	1,609	2,681	3,213
Total other comprehensive income (loss), net of tax	56,031	(4,523)	117,818	3,388
COMPREHENSIVE INCOME (LOSS)	$ 124,381	$ 129,243	$ 225,094	$ 253,098