Earnings Per Common Share (EPS) - Diluted EPS (Details) - $ / shares shares in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Earnings Per Share, Basic and Diluted [Abstract]
Average common shares outstanding (in shares)									55,075	52,268	48,805
Effect of dilutive stock options (in shares)									1,160	1,663	1,296
Total potential shares outstanding (in shares)									56,235	53,931	50,101
Diluted EPS (in dollars per share)	$ (0.08)	$ (0.06)	$ 0.12	$ 0.11	$ 0.16	$ 0.30	$ 0.21	$ 0.10	$ 0.10	$ 0.78	$ 0.55
Stock options excluded as the impact was anti-dilutive (in shares)									1,750	396	381