Earnings Per Common 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
Numerator:
Net earnings	$ 2,565	$ 422	$ 3,859	$ 1,504
Denominator:
Weighted-average common shares outstanding	25,541	24,744	25,370	24,510
Basic earnings per common share	$ 0.10	$ 0.02	$ 0.15	$ 0.06
Numerator:
Net earnings	$ 2,565	$ 422	$ 3,859	$ 1,504
Denominator:
Weighted-average common shares outstanding	25,541	24,744	25,370	24,510
Incremental shares from stock-based compensation plans	709	469	572	391
Denominator for diluted earnings per common share	26,250	25,213	25,942	24,901
Diluted earnings per common share	$ 0.10	$ 0.02	$ 0.15	$ 0.06