Stockholders' Equity - Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Equity [Abstract]
Net income (loss)	$ 7,511	$ 4,178	$ 21,096	$ (32,913)
Weighted average number of common shares outstanding (in shares)	31,570	30,986	31,432	30,894
Dilutive effect of restricted stock grants after application of the treasury stock method (in shares)	1,136	631	1,306	0
Dilutive shares outstanding (in shares)	32,706	31,617	32,738	30,894
Basic earnings (loss) per share (in dollars per share)	$ 0.24	$ 0.13	$ 0.67	$ (1.07)
Diluted earnings (loss) per share (in dollars per share)	$ 0.23	$ 0.13	$ 0.64	$ (1.07)