Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Statement of Comprehensive Income [Abstract]
Net income before noncontrolling interests	$ 115,127	$ 108,904	$ 231,725	$ 244,136
Other comprehensive income (loss):
Change in unrealized translation adjustments	(23,156)	(17,257)	(69,779)	(1,674)
Change in unrealized investment gains (losses), net of taxes	(197,060)	39,535	(189,250)	61,559
Change in net pension asset, net of taxes	1,814	823	3,628	1,647
Other comprehensive income (loss)	(218,402)	23,101	(255,401)	61,532
Comprehensive income (loss)	(103,275)	132,005	(23,676)	305,668
Comprehensive (income) loss to the noncontrolling interest	865	(71)	842	(8)
Comprehensive income (loss) to common stockholders	$ (102,410)	$ 131,934	$ (22,834)	$ 305,660