Computation of Earnings per Share - Summary of net income per share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net income:
Income from continuing operations	$ 2,599	$ 790	$ 4,344	$ 3,227
Loss from discontinued operations		(1,943)		(2,216)
Net income (loss)	$ 2,599	$ (1,153)	$ 4,344	$ 1,011
Shares outstanding:
Weighted-average common shares outstanding (in shares)	22,804	22,571	22,687	22,533
Additional dilutive common stock equivalents (in shares)	89		94	90
Diluted shares outstanding (in shares)	22,893	22,571	22,781	22,623
Basic net income (loss) per share:
Basic net income per share from continuing operations	$ 0.11	$ 0.04	$ 0.19	$ 0.14
Basic net loss per share from discontinued operations (in dollars per share)	$ 0.00	$ (0.09)	$ 0.00	$ (0.10)
Basic net income (loss) per share	$ 0.11	$ (0.05)	$ 0.19	$ 0.04
Diluted net income (loss) per share:
Diluted net income per share from continuing operations	$ 0.11	$ 0.04	$ 0.19	$ 0.14
Diluted net loss per share from discontinued operations	$ 0.00	$ (0.09)	$ 0.00	$ (0.10)
Diluted net income (loss) per share	$ 0.11	$ (0.05)	$ 0.19	$ 0.04