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, 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		75,311							75,311
Other comprehensive (loss) income		6,710						6,710
Dividends declared:			$ (41,570)	$ (343)						$ (41,570)	$ (343)
Net purchase of treasury stock	[1]	24					24					0
Deferred compensation		0										(1,154)	1,154
Ending balance at Mar. 31, 2019		1,013,804			1,992	178	16,483	(123,574)	2,264,815			(1,158,779)	12,689
Beginning balance at Dec. 31, 2019		1,133,253			1,992	178	16,483	(116,868)	2,377,558			(1,158,910)	12,820
Increase (decrease) in shareholders' equity
Net income		59,326							59,326
Other comprehensive (loss) income		(29,576)						(29,576)
Dividends declared:			$ (44,572)	$ (368)						$ (44,572)	$ (368)
Net purchase of treasury stock	[1]	4					4					0
Deferred compensation		0										(772)	772
Ending balance at Mar. 31, 2020		$ 1,116,992			$ 1,992	$ 178	$ 16,487	$ (146,444)	$ 2,390,869			$ (1,159,682)	$ 13,592

[1] Net purchases of treasury stock in 2020 and 2019 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 11, "Capital Stock".