Earnings (Loss) Per Common Share (EPS) - Basic EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share, Basic and Diluted [Abstract]
Net income (loss)	$ 10,958	$ (3,154)
Average common shares outstanding (in shares)	55,717	55,246
Basic EPS (in dollars per share)	$ 0.20	$ (0.06)