Condensed Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Statement Of Income And Comprehensive Income [Abstract]
Net income	$ 50,688	$ 34,948	$ 72,540	$ 71,180
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on securities	13,902	(40,492)	25,804	(40,745)
Unrealized gain (loss) on securities for which credit losses have been recognized in earnings	137	(612)	435	20
Foreign currency translation adjustment	11,612	(9,794)	5,572	(16,616)
Pension benefit adjustment	3,892	4,143	7,783	8,287
Total other comprehensive income (loss), net of tax	29,543	(46,755)	39,594	(49,054)
Comprehensive income (loss)	80,231	(11,807)	112,134	22,126
Less: Comprehensive income attributable to noncontrolling interests	98	268	229	323
Comprehensive income (loss) attributable to the Company	$ 80,133	$ (12,075)	$ 111,905	$ 21,803