Note 18 - Stockholders' Equity (Details Textual) - USD ($) $ in Thousands		3 Months Ended
	Feb. 21, 2023	Mar. 31, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2021
Equity, Attributable to Parent		$ 2,542,339	$ 2,422,230	$ 2,474,040	$ 2,446,251
Stockholders' Equity, Period Increase (Decrease)		68,300
Net Income (Loss) Attributable to Parent		96,007	75,028
Other Comprehensive Income (Loss), Net of Tax		11,218	(42,912)
Share-Based Payment Arrangement, Noncash Expense		1,500
Proceeds from Issuance of Common Stock, Dividend Reinvestment Plan		918	945
Dividends, Common Stock, Cash		24,605	25,515
Treasury Stock, Value, Acquired, Cost Method	$ 16,600	$ 16,736	$ 32,896