Note 2 - Earnings Per Common Share - Computation of Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	2 Months Ended	3 Months Ended		9 Months Ended
	Sep. 03, 2021	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Net income available to common stockholders	$ 32,097	$ 27,406	$ 32,097	$ 88,127	$ 97,315
Earnings allocated to participating securities	(76)	(67)		(217)	(250)
Income attributable to common stock	$ 32,021	$ 27,339		$ 87,910	$ 97,065
Weighted average common shares outstanding, including participating securities (in shares)	39,741	39,243		39,393	39,770
Weighted average participating securities (in shares)	(95)	(96)		(97)	(102)
Weighted average common shares outstanding (in shares)	39,646	39,147		39,296	39,668
Incremental shares from assumed conversions of options, performance units and restricted shares (in shares)	223	192		214	220
Weighted average common and equivalent shares outstanding (in shares)	39,869	39,339		39,510	39,888
Earnings per common share:
Basic (in dollars per share)	$ 0.81	$ 0.70	$ 0.81	$ 2.24	$ 2.45
Diluted (in dollars per share)	$ 0.80	$ 0.70	$ 0.80	$ 2.23	$ 2.43