Net Income (Loss) Per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net Income (Loss) Per Common Share
Number of outstanding options not included in computation of Diluted EPS (in shares)	3,437,000	3,991,000
Numerator
Net Income (Loss)	$ 3,233	$ (682)
Denominator
Weighted average number of common shares outstanding	51,763,000	50,881,000
Effect of outstanding share-based awards	734,000
Weighted average number of shares for diluted earnings (loss) per common share	52,497,000	50,881,000
Basic earnings (loss) per share (in dollars per share)	$ 0.06	$ (0.01)
Diluted earnings (loss) per share (in dollars per share)	$ 0.06	$ (0.01)