Consolidated Statements of Stockholders' Equity (USD $) In Thousands	Total	Common stocks	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Unrealized Investment Gains (Losses) [Member]	Currency Translation Adjustments [Member]	Net Pension Asset [Member]	Treasury Stock [Member]	Noncontrolling Interest [Member]
Stockholders' Equity, beginning of period at Dec. 31, 2011		$ 47,024	$ 941,109	$ 4,491,162		$ 430,419	$ (61,239)	$ (14,329)	$ (1,880,790)	$ 7,526
Adjustments to Additional Paid in Capital Stock Issued During Period, Value, Stock Options Exercised, Value, Restricted Stock Issued Net of Tax Benefit Expense			(24,683)
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition			20,035
Stock issued to directors			454						581
Net income before noncontrolling interests	(345,144)			(345,103)						41
Dividends				(35,728)
Unrealized investment gain related to non-controlling interest	126,520					123,579
Unrealized gains on other-than-temporarily impaired securities						2,870
Net change in period	24,382						24,382
Change in net pension asset, net of taxes	2,470							2,470
Stock exercised/vested									40,137
Stock repurchased									(128,155)
Contributions (distributions)										1,808
Net income (loss)	(41)
Other comprehensive income (loss), net of tax	153,372									71
Stockholders' Equity, end of period at Sep. 30, 2012			936,915	4,800,537	508,152	556,868	(36,857)	(11,859)	(1,968,227)	9,446
Stockholders' Equity, beginning of period at Dec. 31, 2012	4,335,466	47,024	945,166	4,817,807		517,658	(36,676)	(15,351)	(1,969,411)	29,249
Adjustments to Additional Paid in Capital Stock Issued During Period, Value, Stock Options Exercised, Value, Restricted Stock Issued Net of Tax Benefit Expense			(1,428)
Adjustments to Additional Paid in Capital, Share-based Compensation, Restricted Stock Unit or Restricted Stock Award, Requisite Service Period Recognition			17,031
Stock issued to directors			535						597
Net income before noncontrolling interests	(369,913)			(369,546)						367
Dividends				(39,336)
Unrealized investment gain related to non-controlling interest	(228,129)					(228,677)
Unrealized gains on other-than-temporarily impaired securities						534
Net change in period	(25,451)						(25,451)
Change in net pension asset, net of taxes	5,442							5,442
Stock exercised/vested									1,434
Stock repurchased									(39,370)
Contributions (distributions)										(1,406)
Net income (loss)	(367)
Other comprehensive income (loss), net of tax	(248,138)				(248,138)		(25,451)	5,442		14
Stockholders' Equity, end of period at Sep. 30, 2013	4,395,298		961,304	5,148,017	217,479	289,515	(62,127)	(9,909)	(2,006,750)	28,224
Stockholders' Equity, beginning of period at Jun. 30, 2013
Net income before noncontrolling interests	(138,188)
Unrealized investment gain related to non-controlling interest	(38,879)
Net change in period	44,328
Change in net pension asset, net of taxes	1,814
Net income (loss)	(1,214)
Other comprehensive income (loss), net of tax	7,263				7,263		44,328	1,814
Stockholders' Equity, end of period at Sep. 30, 2013	$ 4,395,298				$ 217,479		$ (62,127)	$ (9,909)