CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Unaudited) (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, 2011	$ 205,047	$ 1,135,821	$ (162,542)	$ 30,124	$ (11,635)
Net loss					(927,079)
Change in unrealized investment gains and losses, net (notes 7 and 8)	0	0	0	(78,659)	0
Reissuance of treasury stock, net	0	(8,749)	57,583	0	(51,567)
Equity compensation	0	8,224	0	0	0
Defined benefit plan adjustments, net	0	0	0	(1,221)	0
Unrealized foreign currency translation adjustment	0	0	0	1,593	0
Balance at Dec. 31, 2012	205,047	1,135,296	(104,959)	(48,163)	(990,281)	196,940
Net loss					(72,930)	(72,930)
Change in unrealized investment gains and losses, net (notes 7 and 8)	0	0	0	(9,954)	0	(9,954)
Common stock issuance (note 14)	135,000	528,542	0	0	0
Reissuance of treasury stock, net	0	(7,892)	40,524	0	(34,485)
Equity compensation	0	1,621	0	0	0
Unrealized foreign currency translation adjustment	0	0	0	316	0	316
Balance at Mar. 31, 2013	$ 340,047	$ 1,657,567	$ (64,435)	$ (57,801)	$ (1,097,696)	$ 777,682