Earnings Per Common Share (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
Numerator:
Net income (loss)	$ (1,468)	$ 1,831	$ (5,142)	$ 1,334
Denominator:
Weighted-average common shares outstanding (shares)	29,733	29,053	29,945	28,912
Earnings Per Share, Basic	$ (0.05)	$ 0.06	$ (0.17)	$ 0.05
Numerator:
Net income (loss)	$ (1,468)	$ 1,831	$ (5,142)	$ 1,334
Denominator:
Weighted-average common shares outstanding (shares)	29,733	29,053	29,945	28,912
Incremental shares from stock-based compensation plans (shares)	0	383	0	454
Denominator for diluted earnings (loss) per common share (shares)	29,733	29,436	29,945	29,366
Earnings Per Share, Diluted	$ (0.05)	$ 0.06	$ (0.17)	$ 0.05