Consolidated Statements Of Operations And Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
REVENUES:
Premiums earned	$ 468,197	$ 488,855	$ 939,252	$ 970,780
Net investment income	71,900	73,872	132,749	132,317
Net realized capital gains (losses):
Other-than-temporary impairments on fixed maturity securities	(1,574)	(1,391)	(2,706)	(24,406)
Other-than-temporary impairments on fixed maturity securities transferred to other comprehensive income (loss)
Other net realized capital gains (losses)	(90,717)	30,556	28,183	(12,806)
Total net realized capital gains (losses)	(92,291)	29,165	25,477	(37,212)
Other income (expense)	10,655	(10,700)	20,510	2,402
Total revenues	458,461	581,192	1,117,988	1,068,287
CLAIMS AND EXPENSES:
Incurred losses and loss adjustment expenses	297,228	338,536	586,950	634,598
Commission, brokerage, taxes and fees	60,513	70,409	113,020	136,774
Other underwriting expenses	64,197	58,330	124,092	117,557
Corporate expenses	1,512	2,010	5,109	4,346
Interest, fee and bond issue cost amortization expense	7,954	8,858	16,813	17,717
Total claims and expenses	431,404	478,143	845,984	910,992
INCOME (LOSS) BEFORE TAXES	27,057	103,049	272,004	157,295
Income tax expense (benefit)	(8,601)	33,677	67,168	46,933
NET INCOME (LOSS)	35,658	69,372	204,836	110,362
Other comprehensive income (loss), net of tax :
Unrealized appreciation (depreciation) ("URA(D)") on securities arising during the period	3,825	39,264	13,264	58,864
Less: reclassification adjustment for realized losses (gains) included in net income (loss)	(3,477)	(63)	(6,944)	25,852
Total URA(D) on securities arising during the period	348	39,201	6,320	84,716
Foreign currency translation adjustments	5,372	15,489	8,939	30,421
Benefit plan actuarial net gain (loss) for the period
Reclassification adjustment for amortization of net (gain) loss included in net income (loss)	2,004	1,341	4,008	2,681
Total benefit plan net gain (loss) for the period	2,004	1,341	4,008	2,681
Total other comprehensive income (loss), net of tax	7,724	56,031	19,267	117,818
COMPREHENSIVE INCOME (LOSS)	$ 43,382	$ 125,403	$ 224,103	$ 228,180