Net Income (loss) Per Share Computation of Basic and Dilutive Net Loss per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share [Abstract]
Net income (loss)	$ 13,378	$ 6,551	$ 5,430	$ 4,087	$ 3,832	$ 3,700	$ (390)	$ (922)	$ (1,427)	$ (307)	$ (757)	$ (1,620)	$ 29,446	$ 6,220	$ (4,112)
Denominator for basic earnings per share - weighted average shares (in shares)													105,929,205	105,793,008	96,285,504
Effect of dilutive securities: Stock options and warrants outstanding and convertible debt (in shares)													7,699,277	7,502,496	0
Denominator for diluted earnings per share - weighted average shares adjusted for dilutive securities (in shares)													113,628,482	113,295,504	96,285,504
Income (loss) per common share - basic (in dollars per share)	$ 0.13	$ 0.06	$ 0.05	$ 0.04	$ 0.04	$ 0.03	$ 0.00	$ (0.01)	$ (0.01)	$ 0.00	$ (0.01)	$ (0.02)	$ 0.28	$ 0.06	$ (0.04)
Income (loss) per common share - diluted (in dollars per share)	$ 0.11	$ 0.06	$ 0.05	$ 0.04	$ 0.03	$ 0.03	$ 0.00	$ (0.01)	$ (0.01)	$ 0.00	$ (0.01)	$ (0.02)	$ 0.26	$ 0.05	$ (0.04)