STATEMENTS OF SHAREHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands		Total	Cumulative effect adjustment	[3]	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 Cumulative effect adjustment	[3]	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
Increase (decrease) in shareholders' equity
Common stock (in dollars per share)					$ 0.90	$ 135.00
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		163,065
Other comprehensive (loss) income		10,520								10,520
Ending balance at Jun. 30, 2019		1,063,454					1,992	178	16,483	(119,764)	2,310,655					(1,158,300)	12,210
Increase (decrease) in shareholders' equity
Common stock (in dollars per share)					$ 1.80	$ 270.00
Beginning balance at Mar. 31, 2019		1,013,804					1,992	178	16,483	(123,574)	2,264,815					(1,158,779)	12,689
Increase (decrease) in shareholders' equity
Net income		87,754									87,754
Other comprehensive (loss) income		3,810								3,810
Dividends declared:					$ (41,570)	$ (344)								(41,570)	(344)
Net purchase of treasury stock	[1]	0							0							0
Deferred compensation		0														(443)	443
Rabbi trust distribution	[2]	0														922	(922)
Ending balance at Jun. 30, 2019		1,063,454					1,992	178	16,483	(119,764)	2,310,655					(1,158,300)	12,210
Increase (decrease) in shareholders' equity
Common stock (in dollars per share)					$ 0.90	$ 135.00
Beginning balance at Dec. 31, 2019		1,133,253	$ (1,075)				1,992	178	16,483	(116,868)	2,377,558	$ (1,075)				(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
Increase (decrease) in shareholders' equity
Common stock (in dollars per share)					$ 0.965	$ 144.75
Beginning balance at Dec. 31, 2019		1,133,253	$ (1,075)				1,992	178	16,483	(116,868)	2,377,558	$ (1,075)				(1,158,910)	12,820
Increase (decrease) in shareholders' equity
Net income		141,303
Other comprehensive (loss) income		10,535								10,535
Ending balance at Jun. 30, 2020		1,194,139					1,992	178	16,487	(106,333)	2,427,905					(1,162,546)	16,456
Increase (decrease) in shareholders' equity
Common stock (in dollars per share)					$ 1.93	$ 289.50
Beginning balance at Mar. 31, 2020		1,116,992					1,992	178	16,487	(146,444)	2,390,869					(1,159,682)	13,592
Increase (decrease) in shareholders' equity
Net income		81,977									81,977
Other comprehensive (loss) income		40,111								40,111
Dividends declared:					$ (44,573)	$ (368)								$ (44,573)	$ (368)
Net purchase of treasury stock	[1]	0							0							0
Deferred compensation		0														(3,568)	3,568
Rabbi trust distribution	[2]	0														704	(704)
Ending balance at Jun. 30, 2020		$ 1,194,139					$ 1,992	$ 178	$ 16,487	$ (106,333)	$ 2,427,905					$ (1,162,546)	$ 16,456
Increase (decrease) in shareholders' equity
Common stock (in dollars per share)					$ 0.965	$ 144.75

[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.

[2] Distributions of our Class A shares were made from the rabbi trust to a retired director in 2020 and 2019.

[3] The cumulative effect adjustment is related to the implementation of new credit loss allowance accounting guidance effective January 1, 2020. See Note 2. "Significant Accounting Policies".