Consolidated Statements of Changes in Shareholders' Equity (USD $) In Thousands	Series B Preferred Stock [Member] Accumulated Deficit [Member]	Series B Preferred Stock [Member]	Mandatory Convertible Preferred Stock [Member] Additional Paid-in Capital [Member]	Mandatory Convertible Preferred Stock [Member] Accumulated Deficit [Member]	Mandatory Convertible Preferred Stock [Member]	Stock Issued To Directors [Member] Common Stock [Member]	Stock Issued To Directors [Member] Additional Paid-in Capital [Member]	Stock Issued To Directors [Member]	Bonuses Paid Through Stock Issuances [Member] Common Stock [Member]	Bonuses Paid Through Stock Issuances [Member] Additional Paid-in Capital [Member]	Bonuses Paid Through Stock Issuances [Member]	Common Stock And Warrant Private Placement Issuance [Member] Common Stock [Member]	Common Stock And Warrant Private Placement Issuance [Member] Additional Paid-in Capital [Member]	Common Stock And Warrant Private Placement Issuance [Member]	Common Stock And Warrant Public Offering [Member] Common Stock [Member]	Common Stock And Warrant Public Offering [Member] Additional Paid-in Capital [Member]	Common Stock And Warrant Public Offering [Member]	Series B Preferred Stock [Member]	Series C Mandatory Convertible Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Total
Balances at Dec. 31, 2008																		$ 39	$ 504	$ 45,115	$ 981,161	$ (351,700)	$ (25,022)	$ (640)	$ 649,457
Net income																						67,826			67,826
Options granted																					1,068				1,068
Options exercised																				3	33				36
Share based compensation						6	78	84	230	1,932	2,162
Common stock and warrant issuance												4,348	53,213	57,561	9,200	61,751	70,951
Warrants exercised																				6	53				59
Conversion of convertible preferred stock to common shares																				657	3,902				4,559
Other comprehensive income (loss)																							10,839		10,839
Preferred stock dividends declared	(690)	(690)	16,351	(16,351)																					13,633
Restricted stock units granted																					1,573				1,573
Restricted stock unit distributions																				39	(39)
Balances at Dec. 31, 2009																		39	504	59,604	1,121,076	(300,915)	(14,183)	(640)	865,485
Net income																						48,983			48,983
Options granted																					1,121				1,121
Options exercised																				174	3,743			(718)	3,199
Share based compensation						20	410	430	262	(262)
Warrants exercised																				3,553	46,341				49,894
6.5% Mandatory Convertible Preferred Stock dividends paid in common stock (3,886,000 shares)																				971	5,547				6,518
Other comprehensive income (loss)																							(934)		(934)
Preferred stock dividends declared	(552)	(552)		(13,093)	(13,093)																				13,633
Restricted stock units granted																					1,895				1,895
Restricted stock unit distributions																				120	(120)			(693)	(693)
Balances at Dec. 31, 2010																		39	504	64,704	1,179,751	(265,577)	(15,117)	(2,051)	962,253
Net income																						151,164			151,164
Options exercised																				19	460				479
Share based compensation						11	331	342	2	58	60
Warrants exercised																				536	4,771				5,307
Conversion of convertible preferred stock to common shares																			(504)	4,719	(4,215)
Other comprehensive income (loss)																							(8,381)		(8,381)
Preferred stock dividends declared	(552)	(552)																							552
Common stock dividends declared																						(5,592)			(5,592)
Restricted stock units granted																					1,671				1,671
Restricted stock unit distributions																				80	(80)			(469)	(469)
Common stock issued for assets purchased (5,396,000 shares)																				1,349	32,482				33,831
Balances at Dec. 31, 2011																		$ 39		$ 71,420	$ 1,215,229	$ (120,557)	$ (23,498)	$ (2,520)	$ 1,140,113