Earnings (Loss) Per Common Share (EPS) - Diluted EPS (Details) - $ / shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share, Basic and Diluted [Abstract]
Average common shares outstanding (in shares)	56,302	55,505	56,033	55,386
Effect of dilutive stock awards (in shares)	1,247		1,241
Total potential shares outstanding (in shares)	57,549	55,505	57,274	55,386
Diluted EPS (in dollars per share)	$ 0.21	$ (0.05)	$ 0.49	$ (0.46)
Equity awards excluded as the impact was anti-dilutive (in shares)	419	4,044	815	4,202