Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Earnings Per Share [Abstract]
Net income	$ 43,674	$ 23,232
Preferred stock dividends	(10)	(10)
Net income available to common equity	43,664	23,222
Dividends and undistributed earnings allocated to participating securities	(33)	(22)
Net income available to common shareholders	$ 43,631	$ 23,200
Basic weighted-average shares outstanding (shares)	38,824	38,536
Stock options and other stock compensation (shares)	528	548
Diluted weighted-average shares outstanding (shares)	39,352	39,084
Antidilutive stock options (shares)	0	0
Earnings per share:
Basic (in dollars per share)	$ 1.12	$ 0.60
Diluted (in dollars per share)	$ 1.11	$ 0.59