Condensed Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2012	Mar. 31, 2011
Condensed Consolidated Statements Of Comprehensive Income [Abstract]
Net income (loss)	$ 31,109	$ (15,241)
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on securities	20,374	(369)
Unrealized gain on securities for which credit-related portion was recognized in earnings	2,903	650
Foreign currency translation adjustment	5,865	4,319
Pension benefit adjustment	1,257	3,251
Total other comprehensive income, net of tax	30,399	7,851
Comprehensive income (loss)	61,508	(7,390)
Less: Comprehensive (loss) income attributable to noncontrolling interests	(181)	175
Comprehensive income (loss) attributable to the Company	$ 61,689	$ (7,565)

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