Earnings Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share Reconciliation [Abstract]
Net income (loss)	$ 145,929	$ (1,893)
Weighted average common shares outstanding (in shares)	43,250	43,075
Assumed dilutive effect of stock option exercise (in shares)	0	0
Weighted average common shares outstanding assuming dilution (in shares)	43,250	43,075
Net loss per common share - basic (in dollars per share)	$ 3.37	$ (0.04)
Net loss per common share - assuming dilution (in dollars per share)	$ 3.37	$ (0.04)
Stock Options [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share	0	816