STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands		Total	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 Class A common stock	Retained earnings Class B common stock	Treasury stock	Deferred compensation
Beginning balance 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		68,619							68,619
Other comprehensive income (loss)		(25,189)						(25,189)
Dividends declared:			$ (51,270)	$ (423)						$ (51,270)	$ (423)
Net purchase of treasury stock	[1]	(15)					(15)					0
Deferred compensation		0										(802)	802
Rabbi trust distribution	[2]	0										298	(298)
Ending balance at Mar. 31, 2022		1,334,200			1,992	178	16,481	(50,477)	2,512,116			(1,168,332)	22,242
Beginning balance 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		148,766
Other comprehensive income (loss)		(48,437)						(48,437)
Ending balance at Jun. 30, 2022		1,339,406			1,992	178	16,481	(73,725)	2,540,570			(1,169,140)	23,050
Beginning balance at Mar. 31, 2022		1,334,200			1,992	178	16,481	(50,477)	2,512,116			(1,168,332)	22,242
Increase (decrease) in shareholders' equity
Net income		80,147							80,147
Other comprehensive income (loss)		(23,248)						(23,248)
Dividends declared:			(51,270)	(423)						(51,270)	(423)
Net purchase of treasury stock	[1]	0					0					0
Deferred compensation		0										(907)	907
Rabbi trust distribution	[2]	0										99	(99)
Ending balance at Jun. 30, 2022		1,339,406			1,992	178	16,481	(73,725)	2,540,570			(1,169,140)	23,050
Beginning balance at Dec. 31, 2022		1,448,408			1,992	178	16,481	(7,414)	2,583,261			(1,168,949)	22,859
Increase (decrease) in shareholders' equity
Net income		86,241							86,241
Other comprehensive income (loss)		7,752						7,752
Dividends declared:			(54,965)	(454)						(54,965)	(454)
Net purchase of treasury stock	[1]	(15)					(15)					0
Deferred compensation		0										(822)	822
Rabbi trust distribution	[2]	0										416	(416)
Ending balance at Mar. 31, 2023		1,486,967			1,992	178	16,466	338	2,614,083			(1,169,355)	23,265
Beginning balance at Dec. 31, 2022		1,448,408			1,992	178	16,481	(7,414)	2,583,261			(1,168,949)	22,859
Increase (decrease) in shareholders' equity
Net income		204,093
Other comprehensive income (loss)		3,264						3,264
Ending balance at Jun. 30, 2023		1,544,912			1,992	178	16,466	(4,150)	2,676,516			(1,168,380)	22,290
Beginning balance at Mar. 31, 2023		1,486,967			1,992	178	16,466	338	2,614,083			(1,169,355)	23,265
Increase (decrease) in shareholders' equity
Net income		117,852							117,852
Other comprehensive income (loss)		(4,488)						(4,488)
Dividends declared:			$ (54,965)	$ (454)						$ (54,965)	$ (454)
Net purchase of treasury stock	[1]	0					0					0
Deferred compensation		0										(621)	621
Rabbi trust distribution	[2]	0										1,596	(1,596)
Ending balance at Jun. 30, 2023		$ 1,544,912			$ 1,992	$ 178	$ 16,466	$ (4,150)	$ 2,676,516			$ (1,168,380)	$ 22,290

[1] Net purchases of treasury stock in 2023 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.

[2] Distributions of our Class A shares were made from the rabbi trust to five incentive compensation deferral plan participants in 2023 and two in 2022.