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, 2015		$ 769,503			$ 1,992	$ 178	$ 16,311	$ (96,864)	$ 1,993,976			$ (1,155,108)	$ 9,018
Increase (decrease) in shareholders' equity
Net income		210,366							210,366
Other comprehensive (loss) income		(24,517)						(24,517)
Dividends declared:			$ (137,297)	$ (1,134)						$ (137,297)	$ (1,134)
Net purchase of treasury stock	[1]	(11)					(11)					0
Deferred compensation		0										(738)	738
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
Cumulative effect adjustments	[4]	$ (38,392)							$ (38,392)

[1] Net purchases of treasury stock in 2016, 2017 and 2018 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 12, "Capital Stock", for additional information on treasury stock transactions.

[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 2018 and to a retired director in 2017. See Note 10, "Incentive and Deferred Compensation Plans".

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

[4] Cumulative effect adjustments are primarily related to the implementation of new revenue recognition guidance effective January 1, 2018. See Note 2, "Significant Accounting Policies".