Earnings (Loss) Per Common Share (EPS) - Basic EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ 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, Basic and Diluted [Abstract]
Net income (loss)	$ (3,009)	$ (19,058)	$ (3,154)	$ (3,398)	$ 6,859	$ 6,195	$ (25,221)	$ 9,656
Average common shares outstanding (in shares)	55,505			55,152			55,386	55,029
Basic EPS (in dollars per share)	$ (0.05)			$ (0.06)			$ (0.46)	$ 0.18