Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands		Total		Common Stock [Member]		Additional Paid-In Capital [Member]		Retained Earnings [Member]		Accumulated Other Comprehensive Loss [Member]	Deferred Compensation [Member]		Treasury Stock, Preferred	Treasury Stock, Common
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares Held In Trust For Deferred Compensation Plan		108,000
Common Stock, Dividends, Per Share, Declared		$ 1.715
Beginning Balances (shares) at Dec. 31, 2022	[1],[2]			17,741,000
Beginning Balances at Dec. 31, 2022		$ 832,801		$ 8,635	[1]	$ 380,036		$ 445,509		$ (1,379)	$ 7,060			$ (7,060)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		61,884						61,884
Other comprehensive income (loss)		242								242
Other Comprehensive Income (Loss), Net of Tax		242
Dividend declared		(30,792)						(30,792)
Retirement savings plan and dividend reinvestment plan (shares)	[1],[2],[3]			0
Stock Issued During The Period Value Retirement Savings Plan And Dividend Reinvestment Plan	[3]			$ 0	[1]	(21)
Share-based compensation (shares)	[1],[2],[4],[5]			56,000
Share-based compensation and tax benefit		(21)	[3]	$ 27	[1],[4],[5]	2,536	[4],[5]
Treasury stock activities		2,563	[4],[5]					0	[2]		1,927	[2]		(1,927)	[2]
Ending Balances (shares) at Sep. 30, 2023	[1],[2]			17,797,000
Ending Balances at Sep. 30, 2023		$ 866,677		$ 8,662	[1]	382,551		476,601		(1,137)	8,987			(8,987)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation		20,000
Common Stock, Dividends, Per Share, Declared		$ 0.590
Beginning Balances (shares) at Jun. 30, 2023	[1],[2]			17,797,000
Beginning Balances at Jun. 30, 2023		$ 864,228		$ 8,662	[1]	380,830		477,795		(3,059)	9,001		$ (9,001)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		9,407						9,407
Other comprehensive income (loss)		1,922								1,922
Other Comprehensive Income (Loss), Net of Tax		1,922
Dividend declared		(10,601)						(10,601)
Retirement savings plan and dividend reinvestment plan (shares)	[1],[2],[3]			0
Stock Issued During The Period Value Retirement Savings Plan And Dividend Reinvestment Plan	[3]	(2)		$ 0	[1]	(2)
Share-based compensation (shares)	[1],[2],[4],[5]			0
Share-based compensation and tax benefit	[4],[5]	1,723		$ 0	[1]	1,723
Treasury stock activities								0			(14)			14
Ending Balances (shares) at Sep. 30, 2023	[1],[2]			17,797,000
Ending Balances at Sep. 30, 2023		$ 866,677		$ 8,662	[1]	382,551		476,601		(1,137)	8,987			(8,987)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares Held In Trust For Deferred Compensation Plan		107,000
Preferred Stock, Shares Authorized		2,000,000,000
Preferred Stock, Par or Stated Value Per Share		$ 10.00
Shares Held In Trust For Deferred Compensation Plan		108,000
Common Stock, Dividends, Per Share, Declared		$ 1.870
Beginning Balances (shares) at Dec. 31, 2023	[1],[2],[6]			22,235,000
Beginning Balances at Dec. 31, 2023	[6]	$ 1,246,104		$ 10,823	[1]	749,356		488,663		(2,738)	9,050			(9,050)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		81,946						81,946
Other comprehensive income (loss)		(1,397)								(1,397)
Other Comprehensive Income (Loss), Net of Tax		(1,397)
Dividend declared		(42,183)						(42,183)
Retirement savings plan and dividend reinvestment plan (shares)	[1],[2],[3]			502,000
Stock Issued During The Period Value Retirement Savings Plan And Dividend Reinvestment Plan	[3]	58,551		$ 244	[1]	58,307
Share-based compensation (shares)	[1],[2],[4],[5]			36,000
Share-based compensation and tax benefit	[4],[5]	5,251		$ 18	[1]	5,233
Treasury stock activities	[2]							0			725			(725)
Ending Balances (shares) at Sep. 30, 2024	[1],[2]			22,773,000
Ending Balances at Sep. 30, 2024		$ 1,348,272		$ 11,085	[1]	812,896		528,426		(4,135)	9,775			(9,775)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based Payment Arrangement, Shares Withheld for Tax Withholding Obligation		14,000
Proceeds from Issuance of Senior Long-Term Debt		$ 550,000		$ 4,400
Common Stock, Dividends, Per Share, Declared		$ 0.640
Beginning Balances (shares) at Jun. 30, 2024	[1],[2]			22,299,000
Beginning Balances at Jun. 30, 2024		$ 1,290,554		$ 10,854	[1]	755,751		525,525		(1,576)	9,703		$ (9,703)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income		17,507						17,507
Other comprehensive income (loss)		(2,559)								(2,559)
Other Comprehensive Income (Loss), Net of Tax		(2,559)
Dividend declared		(14,606)						(14,606)
Retirement savings plan and dividend reinvestment plan (shares)	[1],[2],[3]			474,000
Stock Issued During The Period Value Retirement Savings Plan And Dividend Reinvestment Plan	[3]	55,659		$ 231	[1]	55,428
Share-based compensation (shares)	[1],[2],[4],[5]			0
Share-based compensation and tax benefit	[4],[5]	1,717		$ 0	[1]	1,717
Treasury stock activities								0			72			(72)
Ending Balances (shares) at Sep. 30, 2024	[1],[2]			22,773,000
Ending Balances at Sep. 30, 2024		$ 1,348,272		$ 11,085	[1]	$ 812,896		$ 528,426		$ (4,135)	$ 9,775			$ (9,775)
Preferred Stock, Shares Authorized		2,000,000.0
Preferred Stock, Par or Stated Value Per Share		$ 10.00
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares Held In Trust For Deferred Compensation Plan		113,000

[1] 2.0 million shares of preferred stock at $0.01 par value have been authorized. No shares have been issued or are outstanding; accordingly, no information has been included in the Condensed Consolidated Statements of Stockholders’ Equity.    

[2] Includes 113 thousand, 108 thousand, 107 thousand, and 108 thousand shares at September 30, 2024, December 31, 2023, September 30, 2023 and December 31, 2022, respectively, held in a Rabbi Trust related to our Non-Qualified Deferred Compensation Plan.

[3] Includes shares issued under the Retirement Savings Plan and DRIP as applicable.

[4] Includes amounts for shares issued for directors’ compensation.

[5] The shares issued under the SICP are net of shares withheld for employee taxes. For the nine months ended September 30, 2024 and 2023, we withheld 14 thousand and 20 thousand shares, respectively, for employee taxes.

[6] Includes 4.4 million shares issued during 2023 related to the acquisition of FCG. See Notes 3 and 9 for details associated with the FCG acquisition and related financing.