CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (unaudited) (USD $) In Thousands	Total	Common stock [Member]	Paid-in capital [Member]	Treasury stock [Member]	Accumulated other comprehensive income (loss) [Member]	Retained earnings (deficit) [Member]
Balance at Dec. 31, 2010		$ 205,047	$ 1,138,942	$ (222,632)	$ 22,136	$ 525,562
Net loss						(485,892)
Change in unrealized investment gains and losses, net (notes 7 and 8)		0	0	0	21,057	0
Reissuance of treasury stock, net		0	(14,577)	60,090	0	(51,305)
Equity compensation		0	11,456	0	0	0
Defined benefit plan adjustments, net		0	0	0	(12,862)	0
Unrealized foreign currency translation adjustment		0	0	0	(207)	0
Balance at Dec. 31, 2011	1,196,815	205,047	1,135,821	(162,542)	30,124	(11,635)
Net loss	(540,388)					(540,388)
Change in unrealized investment gains and losses, net (notes 7 and 8)	6,781	0	0	0	6,781	0
Reissuance of treasury stock, net		0	(8,749)	57,583	0	(51,569)
Equity compensation		0	6,035	0	0	0
Unrealized foreign currency translation adjustment	1,468	0	0	0	1,468	0
Balance at Sep. 30, 2012	$ 667,976	$ 205,047	$ 1,133,107	$ (104,959)	$ 38,373	$ (603,592)