Earnings Per Common Share (EPS) - Basic EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ 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]
Net income	$ (4,205)	$ (3,398)	$ 6,859	$ 6,195	$ 9,188	$ 16,619	$ 10,941	$ 5,269	$ 5,451	$ 42,017	$ 27,523
Average common shares outstanding (in shares)									55,075	52,268	48,805
Basic EPS (in dollars per share)	$ (0.08)	$ (0.06)	$ 0.12	$ 0.11	$ 0.17	$ 0.31	$ 0.22	$ 0.10	$ 0.10	$ 0.80	$ 0.56