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	Retained earnings	Retained earnings Class A common stock	Retained earnings Class B common stock	Treasury stock	Deferred compensation
Beginning balance 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		73,566							73,566
Other comprehensive (loss) income		(5,289)						(5,289)
Dividends declared:			$ (47,806)	$ (395)						$ (47,806)	$ (395)
Net purchase of treasury stock	[1]	9					9					0
Deferred compensation		0										(846)	846
Rabbi trust distribution	[2]	0										876	(876)
Ending balance at Mar. 31, 2021		1,208,133			1,992	178	16,496	(83,432)	2,418,989			(1,163,640)	17,550
Beginning balance 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		152,595
Other comprehensive (loss) income		850						850
Ending balance at Jun. 30, 2021		1,245,102			1,992	178	16,496	(77,293)	2,449,819			(1,167,211)	21,121
Beginning balance at Mar. 31, 2021		1,208,133			1,992	178	16,496	(83,432)	2,418,989			(1,163,640)	17,550
Increase (decrease) in shareholders' equity
Net income		79,029							79,029
Other comprehensive (loss) income		6,139						6,139
Dividends declared:			(47,805)	(394)						(47,805)	(394)
Net purchase of treasury stock	[1]	0					0					0
Deferred compensation		0										(3,668)	3,668
Rabbi trust distribution	[2]	0										97	(97)
Ending balance at Jun. 30, 2021		1,245,102			1,992	178	16,496	(77,293)	2,449,819			(1,167,211)	21,121
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 (loss) income		(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 (loss) income		(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 (loss) income		(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

[1] Net purchases of treasury stock in 2022 and 2021 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 two incentive compensation deferral plan participants in 2022 and to a retired director and an incentive compensation deferral plan participant in 2021.