Consolidated Statements Of Comprehensive Income (Loss) (Parenthetical) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Consolidated Statements Of Comprehensive Income (Loss) [Abstract]
Net unrealized holding gains (losses) on investments arising during the period, tax provision (benefit)	$ 4,336	$ (9,201)
Less: reclassification adjustment for net (gains) losses included in net income, tax provision (benefit)	114,143	123,791
Net change in unrealized holding gains (losses) on investments, tax provision (benefit)	(109,807)	(132,992)
Net unrealized foreign exchange gains (losses) arising during the period, tax provision (benefit)	(938)	(1,070)
Less: reclassification adjustment for foreign exchange (gains) losses included in net income, tax provision (benefit)	0	0
Net change in unrealized foreign exchange gains (losses), tax provision (benefit)	(938)	(1,070)
Net unrealized gains (losses) on derivatives arising during the period, tax provision (benefit)	2	(89)
Less: reclassification adjustment for derivative (gains) losses included in net income, tax provision (benefit)	0	0
Net change in unrealized derivative gains (losses), tax provision (benefit)	2	(89)
Net pension and postretirement gain (loss) arising during the period, tax provision (benefit)	0	0
Less: reclassification adjustment for pension and postretirement (gains) losses included in net income, tax provision (benefit)	(666)	(433)
Net change in pension liability and postretirement benefits, tax provision (benefit)	$ 666	$ 433