Earnings (loss) Per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Numerator:
Net earnings (loss)	$ (497)	$ 292
Denominator:
Weighted-average common shares outstanding	28,770	25,309
Basic earnings (loss) per common share	$ (0.02)	$ 0.01
Numerator:
Net earnings (loss)	$ (497)	$ 292
Denominator:
Weighted-average common shares outstanding	28,770	25,309
Incremental shares from stock-based compensation plans		456
Denominator for diluted earnings (loss) per common share	28,770	25,765
Diluted earnings (loss) per common share	$ (0.02)	$ 0.01