Earnings Per Share - Reconciliation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Numerator
Net loss - basic and diluted	$ (25,526)	$ (80,696)	$ (12,946)
Denominator
Weighted average common shares outstanding - basic (in shares)	91,460	90,198	89,782
Dilutive effect of stock options and restricted stock awards (in shares)	0	0	0
Dilutive effect of Convertible Notes (in shares)	0	0	0
Weighted average common shares outstanding - diluted (in shares)	91,460	90,198	89,782
Net loss per common share
Net loss per common share - Basic (in dollars per share)	$ (0.28)	$ (0.89)	$ (0.14)
Net loss per common share - diluted (in dollars per share)	$ (0.28)	$ (0.89)	$ (0.14)