Stockholders' Equity - Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Equity [Abstract]
Net (Loss) Income	$ (12,497)	$ 6,146	$ (37,091)	$ 16,132
Weighted average number of common shares outstanding (in shares)	30,890	30,547	30,848	30,530
Dilutive effect of restricted stock grants after application of the treasury stock method (in shares)	0	277	0	201
Dilutive shares outstanding (in shares)	30,890	30,824	30,848	30,731
Basic (loss) earnings per share (in dollars per share)	$ (0.40)	$ 0.20	$ (1.20)	$ 0.53
Diluted (loss) earnings per share (in dollars per share)	$ (0.40)	$ 0.20	$ (1.20)	$ 0.52