Earnings Per Share - Computation of basic and diluted earnings per share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Computation of basic and diluted earnings per share
Net income	$ 269,801	$ 164,089	$ 185,721
Earnings allocated to participating securities	(1,657)	(1,287)	(1,375)
Dividends on preferred stock	(6,875)	(3,533)	0
Net income available to common shareholders, basic	261,269	159,269	184,346
Net income available to common shareholders, diluted	$ 261,269	$ 159,269	$ 184,346
Net income per common share:
Basic (in dollars per share)	$ 2.97	$ 1.91	$ 2.31
Diluted (in dollars per share)	$ 2.97	$ 1.91	$ 2.31
Weighted average common shares:
Basic (in shares)	87,940	83,184	79,700
Effect of dilutive securities:
Diluted (in shares)	88,097	83,248	79,708
Stock options
Effect of dilutive securities:
Dilutive securities (in shares)	9	0	1
Restricted stock units
Effect of dilutive securities:
Dilutive securities (in shares)	148	64	7