Earnings (Loss) Per Common Share (EPS) - Diluted EPS (Details) - $ / shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share, Basic and Diluted [Abstract]
Average common shares outstanding (in shares)	56,061	55,406	55,890	55,326
Effect of dilutive stock awards (in shares)	1,216		1,238
Total potential shares outstanding (in shares)	57,277	55,406	57,128	55,326
Diluted EPS (in dollars per share)	$ 0.09	$ (0.34)	$ 0.28	$ (0.40)
Equity awards excluded as the impact was anti-dilutive (in shares)	990	4,224	1,016	4,282