CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (USD $) In Thousands	Common stock [Member]	Paid-in capital [Member]	Treasury stock [Member]	Accumulated other comprehensive income (loss) [Member]	Retained earnings (deficit) [Member]	Total
Balance at Dec. 31, 2009	$ 130,163	$ 443,294	$ (269,738)	$ 74,155	$ 924,707
Net loss					(363,735)	(363,735)
Change in unrealized investment gains and losses, net (note 6)	0	0	0	(69,074)	0	(69,074)
Common stock shares issued (note 15)	74,884	697,492	0	0	0
Reissuance of treasury stock, net (note 15)	0	(14,425)	47,106	0	(35,410)
Equity compensation (note 18)	0	12,581	0	0	0
Defined benefit plan adjustments, net (note 13)	0	0	0	6,390	0	(6,390)
Unrealized foreign currency translation adjustment, net	0	0	0	10,665	0	10,665
Balance at Dec. 31, 2010	205,047	1,138,942	(222,632)	22,136	525,562
Net loss					(485,892)	(485,892)
Change in unrealized investment gains and losses, net (note 6)	0	0	0	21,057	0	21,057
Reissuance of treasury stock, net (note 15)	0	(14,577)	60,090	0	(51,305)
Equity compensation (note 18)	0	11,456	0	0	0
Defined benefit plan adjustments, net (note 13)	0	0	0	(12,862)	0	12,862
Unrealized foreign currency translation adjustment, net				(207)		(207)
Balance at Dec. 31, 2011	205,047	1,135,821	(162,542)	30,124	(11,635)	1,196,815
Net loss	0	0	0	0	(927,079)	(927,079)
Change in unrealized investment gains and losses, net (note 6)	0	0	0	(78,659)	0	(78,659)
Reissuance of treasury stock, net (note 15)	0	(8,749)	57,583	0	(51,567)
Equity compensation (note 18)	0	8,224	0	0	0
Defined benefit plan adjustments, net (note 13)	0	0	0	(1,221)	0	1,221
Unrealized foreign currency translation adjustment, net	0	0	0	1,593	0	1,593
Balance at Dec. 31, 2012	$ 205,047	$ 1,135,296	$ (104,959)	$ (48,163)	$ (990,281)	$ 196,940