Unaudited Condensed Consolidated Statements of Shareholders' Equity (USD $) In Thousands	Total	Common shares	Preferred shares	Additional paid-in capital	Accumulated other comprehensive (loss) income	Retained earnings	Common shares held in treasury
Balance at beginning of period at Dec. 31, 2009		$ 82,586	$ 20,800	$ 3,357,004	$ 84,927	$ 4,100,782	$ (372)
Net (loss) income	795,518					795,518
Dividends on common shares						(117,078)
Dividends on preferred shares	(25,894)					(25,894)
Issuance of common shares		953		38,563
Issuance of preferred shares			0	0
Change in currency translation adjustment	(66,506)				(66,506)
Change in other accumulated comprehensive income (loss), net of tax	(6,514)				(6,514)
Repurchase of common shares							(682,476)
Balance at end of period at Sep. 30, 2010	7,582,293	83,539	20,800	3,395,567	11,907	4,753,328	(682,848)
Balance at beginning of period at Dec. 31, 2010	7,206,919	84,033	20,800	3,419,864	4,056	4,761,178	(1,083,012)
Net (loss) income	(502,648)					(502,648)
Dividends on common shares						(118,392)
Dividends on preferred shares	(31,614)					(31,614)
Issuance of common shares		548		29,774
Issuance of preferred shares			14,950	346,772
Change in currency translation adjustment	(10,874)				(10,874)
Change in other accumulated comprehensive income (loss), net of tax	(1,049)				(1,049)
Repurchase of common shares							(226,703)
Balance at end of period at Sep. 30, 2011	$ 6,707,683	$ 84,581	$ 35,750	$ 3,796,410	$ (7,867)	$ 4,108,524	$ (1,309,715)