CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Preferred Stock Series A Nonconvertible Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
BALANCE at Dec. 31, 2023	$ 1,447,226	$ 2	$ 487	$ 699,554	$ 789,553	$ (1,086)	$ (41,284)
BALANCE (in shares) at Dec. 31, 2023		200,000	48,731,026
Treasury Stock Common Shares Beginning at Dec. 31, 2023							1,365,648
Net income	109,190				109,190
Other comprehensive income	(3,574)					(3,574)
Cash dividends declared	(38,685)				(38,685)
Stock-based compensation and ESPP activity, net of taxes withheld	12,681		$ 1	12,680
Shares withheld for tax withholding obligations (in shares)			83,247
Treasury Stock Common Shares Ending at Jun. 30, 2024							1,365,648
BALANCE at Jun. 30, 2024	1,526,838	$ 2	$ 488	712,234	860,058	(4,660)	$ (41,284)
BALANCE (in shares) at Jun. 30, 2024		200,000	48,814,273
BALANCE at Mar. 31, 2024	1,484,900	$ 2	$ 488	702,609	826,879	(3,794)	$ (41,284)
BALANCE (in shares) at Mar. 31, 2024		200,000	48,804,964
Treasury Stock Common Shares Beginning at Mar. 31, 2024							1,365,648
Net income	52,337				52,337
Other comprehensive income	(866)					(866)
Cash dividends declared	(19,158)				(19,158)
Stock-based compensation and ESPP activity, net of taxes withheld	9,625			9,625
Shares withheld for tax withholding obligations (in shares)			9,309
Treasury Stock Common Shares Ending at Jun. 30, 2024							1,365,648
BALANCE at Jun. 30, 2024	1,526,838	$ 2	$ 488	712,234	860,058	(4,660)	$ (41,284)
BALANCE (in shares) at Jun. 30, 2024		200,000	48,814,273
BALANCE at Dec. 31, 2024	1,616,525	$ 2	$ 488	723,719	934,655	(1,055)	$ (41,284)
BALANCE (in shares) at Dec. 31, 2024		200,000	48,834,541
Treasury Stock Common Shares Beginning at Dec. 31, 2024							1,365,648
Net income	131,708				131,708
Other comprehensive income	1,208					1,208
Cash dividends declared	(43,179)				(43,179)
Stock-based compensation and ESPP activity, net of taxes withheld	8,350		$ 1	8,349
Shares withheld for tax withholding obligations (in shares)			65,178
Treasury Stock Common Shares Ending at Jun. 30, 2025							1,365,648
BALANCE at Jun. 30, 2025	1,714,612	$ 2	$ 489	732,068	1,023,184	153	$ (41,284)
BALANCE (in shares) at Jun. 30, 2025		200,000	48,899,719
BALANCE at Mar. 31, 2025	1,659,332	$ 2	$ 489	722,275	977,556	294	$ (41,284)
BALANCE (in shares) at Mar. 31, 2025		200,000	48,937,424
Treasury Stock Common Shares Beginning at Mar. 31, 2025							1,365,648
Net income	67,264				67,264
Other comprehensive income	(141)					(141)
Cash dividends declared	(21,636)				(21,636)
Stock-based compensation and ESPP activity, net of taxes withheld	9,793			9,793
Shares withheld for tax withholding obligations (in shares)			37,705
Treasury Stock Common Shares Ending at Jun. 30, 2025							1,365,648
BALANCE at Jun. 30, 2025	$ 1,714,612	$ 2	$ 489	$ 732,068	$ 1,023,184	$ 153	$ (41,284)
BALANCE (in shares) at Jun. 30, 2025		200,000	48,899,719