Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	COMMON STOCK [Member]	CAPITAL SURPLUS [Member]	RETAINED EARNINGS [Member]	ACCUMULATED OTHER COMPREHENSIVE LOSS [Member]
Balance at beginning of period at Dec. 31, 2022		$ 32,876	$ 169,231	$ 1,120,292	$ (71,563)
Shares issued for stock options		24	618
Net income	$ 57,533			57,533
Dividends on common stock				(13,160)
Stock-based compensation arrangements			382
Net change					14,649
Balance at end of period at Mar. 31, 2023	1,310,882	32,900	170,231	1,164,665	(56,914)
Balance at beginning of period at Dec. 31, 2023	1,433,891	32,933	174,695	1,276,305	(50,042)
Shares issued for stock options		34	817
Net income	50,334			50,334
Dividends on common stock				(14,175)
Stock-based compensation arrangements			715
Net change					(2,304)
Balance at end of period at Mar. 31, 2024	$ 1,469,312	$ 32,967	$ 176,227	$ 1,312,464	$ (52,346)