Consolidated Statements of Comprehensive Income (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Statement of Income and Comprehensive Income [Abstract]
Net income before noncontrolling interests	$ 77,269	$ 93,669	$ 276,779	$ 322,674
Other comprehensive income (loss):
Change in unrealized foreign exchange gains (losses)	(30,957)	17,985	(21,104)	765
Unrealized holding gains (losses) on investment securities arising during the period, net of taxes	39,031	125,329	125,085	245,908
Reclassification adjustment for net investment losses included in net income, net of taxes	(13,784)	(3,364)	(46,910)	(14,656)
Change in unrecognized pension obligation, net of taxes	707	561	2,118	1,681
Other comprehensive income (loss)	(5,003)	140,511	59,189	233,698
Comprehensive income	72,266	234,180	335,968	556,372
Comprehensive income (loss) to the noncontrolling interests	40	(53)	87	(249)
Comprehensive income to common stockholders	$ 72,306	$ 234,127	$ 336,055	$ 556,123