Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]
Net income	$ 263,455	$ 348,150	$ 322,690
Other comprehensive income (loss), net of tax:
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax	141,399	129,330	(77,280)
Other than temporary impairment losses investments portion in other comprehensive income loss after tax	(13,751)	(38,406)	(26,481)
Reclassification for net losses on investments included in earnings	1,775	(12,204)	(7,392)
Other than temporary impairment losses investments portion recognized in earnings, net after tax	99,903	63,564	20,244
Other than temporary impairment losses, investments, accretion of noncredit portion, held-to-maturity securities, after tax	1,258	6,863	410
Net unrealized losses on derivative instruments	(431)	247	1,355
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Net of Tax	(1,580)	(7,857)	(22,653)
Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Adjustment, Net of Tax	25,483	4,390	(18,991)
Other comprehensive income (loss)	254,056	145,927	(130,788)
Comprehensive income (loss)	517,511	494,077	191,902
Comprehensive loss applicable to noncontrolling interests	(336)	(1,366)	(1,114)
Comprehensive income applicable to controlling interest	$ 517,847	$ 495,443	$ 193,016