Earnings (Loss) Per Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Computation of basic and diluted earnings per common share [Abstract]
Net income (loss)	$ (2,213)	$ 8,086	$ (5,316)	$ 14,837
Weighted average shares - Basic (in shares)	25,980	25,771	25,876	25,830
Effect of dilutive stock options (in shares)	0	205	0	341
Adjusted weighted average shares and assumed conversions - Diluted (in shares)	25,980	25,976	25,876	26,171
Basic earnings (loss) per common share (in dollars per share)	$ (0.09)	$ 0.31	$ (0.21)	$ 0.57
Diluted earnings (loss) per common share (in dollars per share)	$ (0.09)	$ 0.31	$ (0.21)	$ 0.57
Potentially dilutive outstanding stock options excluded from the computation of diluted earnings per share [Abstract]
Anti-dilutive options (in shares)	122		131
Stock Options [Member]
Potentially dilutive outstanding stock options excluded from the computation of diluted earnings per share [Abstract]
Anti-dilutive options (in shares)	1,531	1,046	1,516	435
Stock Options [Member] | Minimum [Member]
Potentially dilutive outstanding stock options excluded from the computation of diluted earnings per share [Abstract]
Exercise price range, lower limit (in dollars per share)	$ 11.71	$ 12.02	$ 11.71	$ 12.02
Stock Options [Member] | Maximum [Member]
Potentially dilutive outstanding stock options excluded from the computation of diluted earnings per share [Abstract]
Exercise price range, upper limit (in dollars per share)	$ 21.08	$ 21.08	$ 21.08	$ 21.08