STATEMENTS OF SHAREHOLDERS' EQUITY - 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 income (loss)	Retained earnings	Retained earnings Class A Common Stock	Retained earnings Class B Common Stock	Treasury stock	Deferred compensation
Balance, end of year at Dec. 31, 2016		$ 816,910			$ 1,992	$ 178	$ 16,300	$ (121,381)	$ 2,065,911			$ (1,155,846)	$ 9,756
Increase (Decrease) in Shareholders' Equity
Net income		196,999							196,999
Other comprehensive (loss) income		(8,295)						(8,295)
Dividends declared:			$ (147,225)	$ (1,215)						$ (147,225)	$ (1,215)
Net purchase of treasury stock	[1]	170					170					0
Deferred compensation		0										(1,177)	1,177
Rabbi trust distribution	[2]	0										1,355	(1,355)
AOCI reclassification	[3]	0						(26,383)	26,383
Balance, end of year at Dec. 31, 2017		857,344			1,992	178	16,470	(156,059)	2,140,853			(1,155,668)	9,578
Increase (Decrease) in Shareholders' Equity
Net income		288,224							288,224
Other comprehensive (loss) income		25,775						25,775
Dividends declared:			(157,964)	(1,304)						(157,964)	(1,304)
Net purchase of treasury stock	[1]	(11)					(11)					0
Deferred compensation		0										(2,566)	2,566
Rabbi trust distribution	[2]	0										609	(609)
Balance, end of year at Dec. 31, 2018		973,672			1,992	178	16,459	(130,284)	2,231,417			(1,157,625)	11,535
Increase (Decrease) in Shareholders' Equity
Net income		316,821							316,821
Other comprehensive (loss) income		13,416						13,416
Dividends declared:			$ (169,283)	$ (1,397)						$ (169,283)	$ (1,397)
Net purchase of treasury stock	[1]	24					24					0
Deferred compensation		0										(2,208)	2,208
Rabbi trust distribution	[2]	0										923	(923)
Balance, end of year at Dec. 31, 2019		$ 1,133,253			$ 1,992	$ 178	$ 16,483	$ (116,868)	$ 2,377,558			$ (1,158,910)	$ 12,820

[1] Net purchases of treasury stock in 2017, 2018 and 2019 includes the repurchase of our Class A common stock in the open market that were subsequently distributed to satisfy stock based compensation awards. See Note 11, "Incentive and Deferred Compensation Plans".

[2] 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 2019 and 2018 and to a retired director in 2017. See Note 11, "Incentive and Deferred Compensation Plans".

[3] A one-time adjustment was made in 2017 to reclassify stranded tax effects of the components of accumulated other comprehensive income ("AOCI") (loss) resulting from enactment of Tax Cuts and Jobs Act ("TCJA") from AOCI (loss) to retained earnings. See Note 2, "Significant Accounting Policies".