Description of Business and Basis of Presentation (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Schedule of computation of basic and diluted net income (loss) per share
Net income	$ (1,181)	$ 3,405	$ (862)	$ 3,127
Effect of assumed conversion of convertible debentures
Weighted-average common shares outstanding	29,206	28,858	29,127	28,842
Weighted-average common shares outstanding, assuming dilution	29,206	28,860	29,127	28,859
Net income per share
Basic	$ (0.04)	$ 0.12	$ (0.03)	$ 0.11
Diluted	$ (0.04)	$ 0.12	$ (0.03)	$ 0.11
Stock Options
Effect of assumed conversion of convertible debentures
Effect of potentially dilutive securities	0	0	0	12
Restricted Stock [Member]
Effect of assumed conversion of convertible debentures
Effect of potentially dilutive securities	0	2	0	5