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 before noncontrolling interests	$ 505,301	$ 510,643	$ 391,141
Other comprehensive income:
Change in unrealized translation adjustments	(23,848)	24,563	(18,751)
Change in unrealized investment gains (losses), net of taxes	(261,064)	87,316	95,617
Change in unrecognized pension obligation, net of taxes	8,700	(1,022)	1,367
Other comprehensive income	(276,212)	110,857	78,233
Comprehensive income	229,089	621,500	469,374
Comprehensive income (loss) to the noncontrolling interest	(5,404)	(128)	125
Comprehensive income to common shareholders	$ 223,685	$ 621,372	$ 469,499