CALCULATION OF EARNINGS PER COMMON SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2010	Jun. 30, 2010	Mar. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Earnings Per Share [Abstract]
Net income (loss)	$ 14,688	$ 15,620	$ 25,390	$ 9,184	$ 5,070	$ 6,030	$ 2,199	$ (7,842)	$ (12,691)	$ (42,742)	$ (4,946)	$ (1,517)	$ 64,882	$ 5,457	$ (61,896)
Preferred stock dividend accrual	(611)	(1,227)	(1,550)	(1,550)	(1,550)	(1,550)	(1,550)	(1,550)	(1,550)	(1,550)	(1,550)	(1,550)	(4,938)	(6,200)	(6,200)
Preferred stock discount accrual	(1,174)	(1,216)	(454)	(454)	(425)	(425)	(425)	(426)	(398)	(398)	(399)	(398)	(3,298)	(1,701)	(1,593)
Gain on repurchase of preferred stock	401	2,070	0	0									2,471	0	0
NET INCOME (LOSS) AVAILABLE TO COMMON SHAREHOLDERS	$ 13,304	$ 15,247	$ 23,386	$ 7,180	$ 3,095	$ 4,055	$ 224	$ (9,818)	$ (14,639)	$ (44,690)	$ (6,895)	$ (3,465)	$ 59,117	$ (2,444)	$ (69,689)
Weighted average number of common shares outstanding
Basic weighted average shares outstanding (in shares)													18,650	16,724	9,665
Diluted weighted shares outstanding (in shares)													18,723	16,724	9,665
Earnings (loss) per common share
Basic (in dollars per share)	$ 0.69	$ 0.80	$ 1.27	$ 0.40	$ 0.18	$ 0.24	$ 0.01	$ (0.61)	$ (0.91)	$ (2.80)	$ (1.96)	$ (1.12)	$ 3.17	$ (0.15)	$ (7.21)
Diluted (in dollars per share)	$ 0.69	$ 0.79	$ 1.27	$ 0.40	$ 0.18	$ 0.24	$ 0.01	$ (0.61)	$ (0.91)	$ (2.80)	$ (1.96)	$ (1.12)	$ 3.16	$ (0.15)	$ (7.21)