Earnings (Loss) Per Common Share (EPS) - Diluted EPS (Details) - $ / shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Average common shares outstanding (in shares)	55,505	55,152	55,386	55,029
Effect of dilutive stock options (in shares)				1,364
Total potential shares outstanding (in shares)	55,505	55,152	55,386	56,393
Diluted EPS (in dollars per share)	$ (0.05)	$ (0.06)	$ (0.46)	$ 0.17
Stock options excluded as the impact was anti-dilutive (in shares)	4,044	4,299	4,202	1,361
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options excluded as the impact was anti-dilutive (in shares)	2,200	2,400	2,200
Net loss incurred, the potentially dilutive effect of these options	951	979	855