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		63	1,914
Net income	$ 112,543			112,543
Dividends on common stock				(26,336)
Stock-based compensation arrangements			1,213
Net change					558
Balance at end of period at Jun. 30, 2023	1,340,791	32,939	172,358	1,206,499	(71,005)
Balance at beginning of period at Mar. 31, 2023		32,900	170,231	1,164,665	(56,914)
Shares issued for stock options		39	1,296
Net income	55,010			55,010
Dividends on common stock				(13,176)
Stock-based compensation arrangements			831
Net change					(14,091)
Balance at end of period at Jun. 30, 2023	1,340,791	32,939	172,358	1,206,499	(71,005)
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		89	2,476
Net income	100,975			100,975
Dividends on common stock				(28,375)
Stock-based compensation arrangements			1,635
Net change					1,801
Balance at end of period at Jun. 30, 2024	1,512,492	33,022	178,806	1,348,905	(48,241)
Balance at beginning of period at Mar. 31, 2024		32,967	176,227	1,312,464	(52,346)
Shares issued for stock options		55	1,659
Net income	50,641			50,641
Dividends on common stock				(14,200)
Stock-based compensation arrangements			920
Net change					4,105
Balance at end of period at Jun. 30, 2024	$ 1,512,492	$ 33,022	$ 178,806	$ 1,348,905	$ (48,241)