Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share
Total anti-dilutive shares (in shares)	34,379			10			20,202	0
Net income	$ 6,815	$ 31,054	$ (15,748)	$ 5,691	$ 10,035	$ (6,951)	$ 22,121	$ 8,775
Weighted average shares outstanding - basic	38,133,598			37,349,144			37,878,753	37,218,234
Effect of potentially dilutive restricted stock units and options	503,938			637,716			613,212	703,533
Weighted average shares outstanding - diluted	38,637,536			37,986,860			38,491,965	37,921,767
Basic and diluted:
Basic income per share	$ 0.18			$ 0.15			$ 0.58	$ 0.24
Diluted income per share	$ 0.18			$ 0.15			$ 0.57	$ 0.23