Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings
Beginning balance (in shares) at Dec. 31, 2020		64,851,126
Beginning balance at Dec. 31, 2020	$ 2,119,912	$ 649	$ 1,407,597	$ 711,666
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	110,690			110,690
Shares issued under stock-based compensation programs, net (in shares)		221,303
Shares issued under stock-based compensation programs, net	1,009	$ 2	1,007
Cash dividends declared	(25,978)			(25,978)
Stock dividends declared (in shares)		5,192,776
Stock dividends declared	(687)	$ 52	279,579	(280,318)
Stock-based compensation expense	9,926		9,926
Ending balance (in shares) at Mar. 31, 2021		70,265,205
Ending balance at Mar. 31, 2021	2,214,872	$ 703	1,698,109	516,060
Beginning balance (in shares) at Dec. 31, 2020		64,851,126
Beginning balance at Dec. 31, 2020	2,119,912	$ 649	1,407,597	711,666
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	265,042
Ending balance (in shares) at Jun. 30, 2021		70,619,638
Ending balance at Jun. 30, 2021	2,332,559	$ 706	1,689,689	642,164
Beginning balance (in shares) at Mar. 31, 2021		70,265,205
Beginning balance at Mar. 31, 2021	2,214,872	$ 703	1,698,109	516,060
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	154,352			154,352
Shares issued under stock-based compensation programs, net (in shares)		358,993
Shares issued under stock-based compensation programs, net	(16,543)	$ 3	(16,546)
Cash dividends declared	(28,248)			(28,248)
Stock-based compensation expense	8,126		8,126
Forfeiture of restricted stock (in shares)		(4,560)
Ending balance (in shares) at Jun. 30, 2021		70,619,638
Ending balance at Jun. 30, 2021	$ 2,332,559	$ 706	1,689,689	642,164
Beginning balance (in shares) at Dec. 31, 2021	70,668,093	70,668,093
Beginning balance at Dec. 31, 2021	$ 2,597,146	$ 707	1,709,276	887,163
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	148,421			148,421
Shares issued under stock-based compensation programs, net (in shares)		498,921
Shares issued under stock-based compensation programs, net	(12,628)	$ 5	(12,633)
Cash dividends declared	(35,583)			(35,583)
Stock-based compensation expense	13,726		13,726
Forfeiture of restricted stock (in shares)		(4,769)
Ending balance (in shares) at Mar. 31, 2022		71,162,245
Ending balance at Mar. 31, 2022	$ 2,711,082	$ 712	1,710,369	1,000,001
Beginning balance (in shares) at Dec. 31, 2021	70,668,093	70,668,093
Beginning balance at Dec. 31, 2021	$ 2,597,146	$ 707	1,709,276	887,163
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	$ 337,963
Ending balance (in shares) at Jun. 30, 2022	71,157,875	71,157,875
Ending balance at Jun. 30, 2022	$ 2,874,317	$ 712	1,719,642	1,153,963
Beginning balance (in shares) at Mar. 31, 2022		71,162,245
Beginning balance at Mar. 31, 2022	2,711,082	$ 712	1,710,369	1,000,001
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	189,542	$ 0	0	189,542
Shares issued under stock-based compensation programs, net (in shares)		1,573
Shares issued under stock-based compensation programs, net	(58)	$ 0	(58)	0
Cash dividends declared	(35,580)			(35,580)
Stock-based compensation expense	$ 9,331		9,331
Forfeiture of restricted stock (in shares)		(2,797)
Ending balance (in shares) at Jun. 30, 2022	71,157,875	71,157,875
Ending balance at Jun. 30, 2022	$ 2,874,317	$ 712	$ 1,719,642	$ 1,153,963