STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) $ in Thousands		Total	Cumulative Effect, Period of Adoption, Adjustment	[1]	Class A common stock	Class B common stock	Common stock Class A common stock	Common stock Class B common stock	Additional paid-in-capital	Accumulated other comprehensive (loss) income	Retained earnings	Retained earnings Cumulative Effect, Period of Adoption, Adjustment	[1]	Retained earnings Class A common stock	Retained earnings Class B common stock	Treasury stock	Deferred compensation
Balance, beginning of year at Dec. 31, 2019		$ 1,133,253	$ (1,075)				$ 1,992	$ 178	$ 16,483	$ (116,868)	$ 2,377,558	$ (1,075)				$ (1,158,910)	$ 12,820
Increase (Decrease) in Shareholders' Equity
Net income		293,304									293,304
Other comprehensive income		38,725								38,725
Dividends declared					$ (273,902)	$ (2,261)								$ (273,902)	$ (2,261)
Net purchase of treasury stock	[2]	4							4							0
Deferred compensation		0														(5,465)	5,465
Rabbi trust distribution	[3]	0														705	(705)
Balance, end of year at Dec. 31, 2020		1,188,048					1,992	178	16,487	(78,143)	2,393,624					(1,163,670)	17,580
Increase (Decrease) in Shareholders' Equity
Net income		297,860									297,860
Other comprehensive income		52,855								52,855
Dividends declared					(194,687)	(1,607)								(194,687)	(1,607)
Net purchase of treasury stock	[2]	9							9							0
Deferred compensation		0														(5,131)	5,131
Rabbi trust distribution	[3]	0														973	(973)
Balance, end of year at Dec. 31, 2021		1,342,478					1,992	178	16,496	(25,288)	2,495,190					(1,167,828)	21,738
Increase (Decrease) in Shareholders' Equity
Net income		298,569									298,569
Other comprehensive income		17,874								17,874
Dividends declared					$ (208,775)	$ (1,723)								$ (208,775)	$ (1,723)
Net purchase of treasury stock	[2]	(15)							(15)							0
Deferred compensation		0														(2,975)	2,975
Rabbi trust distribution	[3]	0														1,854	(1,854)
Balance, end of year at Dec. 31, 2022		$ 1,448,408					$ 1,992	$ 178	$ 16,481	$ (7,414)	$ 2,583,261					$ (1,168,949)	$ 22,859

[1] The cumulative effect adjustment in 2020 is related to the implementation of credit loss allowance accounting guidance effective January 1, 2020. See Note 2, "Significant Accounting Policies."

[2] Net purchases of treasury stock in 2020, 2021 and 2022 include the repurchase of our Class A common stock in the open market that were subsequently distributed to satisfy stock-based compensation awards. See Note 10, "Incentive and Deferred Compensation Plans".

[3] Distributions of our Class A shares were made from the rabbi trust to a retired director and an incentive compensation deferral plan participant in both 2020 and 2021, and to four incentive compensation deferral plan participants in 2022. See Note 10, "Incentive and Deferred Compensation Plans".