Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share [Abstract]
Net income (loss)	$ 20,421	$ (3,790)	$ (79,237)
Weighted average common shares outstanding	204,573,287	180,655,435	150,430,239
Dilutive effect of potential common shares from restricted stock units and stock options	1,414,222
Weighted average common shares outstanding - diluted	205,987,509	180,655,435	150,430,239
Basic (in dollars per share)	$ 0.10	$ (0.02)	$ (0.53)
Diluted (in dollars per share)	$ 0.10	$ (0.02)	$ (0.53)