Consolidated Statements Of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011		Sep. 30, 2011		Jun. 30, 2011		Mar. 31, 2011		Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income	$ 93,202	$ 103,900	$ 73,517	$ 31,109	$ 40,378	[1]	$ 21,295	[1],[2]	$ 32,147	[1]	$ (15,241)	[1]	$ 301,728	$ 78,579	$ 128,956
Other comprehensive income (loss), net of tax:
Unrealized gain (loss) on securities													31,445	(12,316)	2,489
Unrealized gain on securities for which credit-related portion was recognized in earnings													3,902	2,144	4,820
Foreign currency translation adjustment													5,131	(6,167)	5,705
Pension benefit adjustment													(13,571)	(12,034)	(10,629)
Total other comprehensive income(loss), net of tax													26,907	(28,373)	2,385
Comprehensive income													328,635	50,206	131,341
Less: Comprehensive income attributable to noncontrolling interests													691	233	5,177
Comprehensive income attributable to the Company													$ 327,944	$ 49,973	$ 126,164

[1] Net income for the year ended December 31, 2011 includes a net increase of $1.6 million related to certain items that should have been recorded in a prior year. These items increased diluted net income per share attributable to the Company's stockholders by $0.02 for the year.

[2] Net income for the third quarter ended September 30, 2011 includes a net reduction of $0.9 million related to certain items that should have been recorded in a prior quarter. These items decreased diluted net income per share attributable to the Company's stockholders by $0.01 for the quarter. The Company assessed these items and concluded that such items were not material to the previously reported consolidated financial statements and are not material to the consolidated financial statements for the year ended December 31, 2011.