Earnings (Loss) Per Common Share (EPS) - Diluted EPS (Details) - $ / shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Average common shares outstanding (in shares)	55,406	55,017	55,326	54,967
Effect of dilutive stock options (in shares)		1,538		1,556
Total potential shares outstanding (in shares)	55,406	56,555	55,326	56,523
Diluted EPS (in dollars per share)	$ (0.34)	$ 0.12	$ (0.40)	$ 0.23
Stock options excluded as the impact was anti-dilutive (in shares)	4,224	1,185	4,282	1,081
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Stock options excluded as the impact was anti-dilutive (in shares)	2,271		2,256
Net loss incurred, the potentially dilutive effect of these options	844		807