Shareholders' Equity and Earnings Per Share - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Reconciliation of factors used in computing basic and diluted earnings per common share
Net income	$ 1,861	$ 12,146
Weighted average common shares outstanding for basic earnings per common share (in shares)	59,286,927	43,108,208
Dilutive potential common shares	907,098	562,133
Shares used in computing diluted earnings per common share (in shares)	60,194,025	43,670,341
Basic earnings per share (in dollars per share)	$ 0.03	$ 0.28
Diluted earnings per share (in dollars per share)	$ 0.03	$ 0.28
Number of shares not in computing diluted earnings per common share	908,276	539,000