Earnings Per Common Share (EPS) - Diluted EPS (Details) - $ / shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share, Basic and Diluted [Abstract]
Average common shares outstanding (in shares)	55,152	53,431	55,029	51,434
Effect of dilutive stock options (in shares)		1,672	1,364	1,662
Total potential shares outstanding (in shares)	55,152	55,103	56,393	53,096
Diluted EPS (in dollars per share)	$ (0.06)	$ 0.30	$ 0.17	$ 0.62
Stock options excluded as the impact was anti-dilutive (in shares)	4,299	667	1,361	462