Net Income (Loss) Per 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, 2012	Dec. 31, 2011	Dec. 31, 2010
Summary of net loss per common share
Weighted average shares outstanding									16,012	12,956	12,886
Less: restricted stock issued									(251)	(149)	(135)
Weighted Average Number of Shares Outstanding, Basic, Total									15,761	12,807	12,751
Dilutive shares:
Restricted stock awards									138
Stock options									187
Diluted divisor									16,086	12,807	12,751
Net income (loss)	$ 91,648	$ 233	$ 1,198	$ 3,229	$ 1,715	$ 3,090	$ 5,883	$ (18,398)	$ 96,308	$ (7,710)	$ (12,579)
Net income (loss) per share:
Basic	$ 5.23	$ 0.01	$ 0.07	$ 0.25	$ 0.14	$ 0.24	$ 0.46	$ (1.44)	$ 6.11	$ (0.60)	$ (0.99)
Diluted	$ 5.12	$ 0.01	$ 0.07	$ 0.25	$ 0.14	$ 0.24	$ 0.46	$ (1.44)	$ 5.99	$ (0.60)	$ (0.99)