CONDENSED CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Treasury Stock	Retained Earnings	AOCI Attributable to Noncontrolling Interest
Beginning balance (in shares) at Dec. 31, 2018		37,989,376
Beginning balance at Dec. 31, 2018	$ 298,660	$ 380	$ 125,629	$ (30,233)	$ 202,884	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Release of restricted stock (in shares)		161,980
Release of restricted stock	1	$ 1
Share-based compensation - equity awards	151		151
Retirement of treasury shares	0		(30,233)	30,233
Share repurchases (in shares)		(16,340)
Share repurchases	(409)			(409)
Stock issued for purchase of Dover Downs (in shares)		2,976,825
Stock issued for purchase of Dover Downs	86,780	$ 30	86,750
Net loss	17,596				17,596
Ending balance (in shares) at Mar. 31, 2019		41,111,841
Ending balance at Mar. 31, 2019	402,779	$ 411	182,297	(409)	220,480	0
Beginning balance (in shares) at Dec. 31, 2018		37,989,376
Beginning balance at Dec. 31, 2018	298,660	$ 380	125,629	(30,233)	202,884	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Bad debt expense	58
Net loss	34,776
Ending balance (in shares) at Jun. 30, 2019		41,147,597
Ending balance at Jun. 30, 2019	417,443	$ 411	183,925	(409)	233,516	0
Beginning balance (in shares) at Mar. 31, 2019		41,111,841
Beginning balance at Mar. 31, 2019	402,779	$ 411	182,297	(409)	220,480	0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Release of restricted stock (in shares)		35,756
Release of restricted stock	0	$ 0
Dividends	(4,144)				(4,144)
Share-based compensation - equity awards	1,628		1,628
Net loss	17,180				17,180
Ending balance (in shares) at Jun. 30, 2019		41,147,597
Ending balance at Jun. 30, 2019	417,443	$ 411	183,925	(409)	233,516	0
Beginning balance (in shares) at Dec. 31, 2019		32,113,328
Beginning balance at Dec. 31, 2019	211,411	$ 412	185,544	(223,075)	250,418	(1,888)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Release of restricted stock (in shares)		131,131
Release of restricted stock	(2,483)	$ 1	(2,484)
Dividends	(3,174)				(3,174)
Share-based compensation - equity awards	5,542		5,542
Retirement of treasury shares	0	$ (107)	(48,618)	254,416	(205,691)
Share repurchases (in shares)		(1,649,768)
Share repurchases	(31,341)			(31,341)
Net loss	(8,878)				(8,878)
Ending balance (in shares) at Mar. 31, 2020		30,594,691
Ending balance at Mar. 31, 2020	171,019	$ 306	139,984	0	32,617	(1,888)
Beginning balance (in shares) at Dec. 31, 2019		32,113,328
Beginning balance at Dec. 31, 2019	$ 211,411	$ 412	185,544	(223,075)	250,418	(1,888)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock cash dividend declared (in dollars per share)	$ 0.10
Share repurchases (in shares)	(1,812,393)
Share repurchases	$ (33,292)
Bad debt expense	813
Net loss	(32,433)
Ending balance (in shares) at Jun. 30, 2020		30,456,493
Ending balance at Jun. 30, 2020	147,559	$ 304	141,297	0	7,846	(1,888)
Beginning balance (in shares) at Mar. 31, 2020		30,594,691
Beginning balance at Mar. 31, 2020	171,019	$ 306	139,984	0	32,617	(1,888)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Release of restricted stock (in shares)		24,427
Release of restricted stock	(81)	$ 0	(81)
Share-based compensation - equity awards	2,127		2,127
Retirement of treasury shares	$ 0	$ (2)	(733)	1,951	(1,216)
Share repurchases (in shares)	(162,625)	(162,625)
Share repurchases	$ (1,951)			(1,951)
Net loss	(23,555)				(23,555)
Ending balance (in shares) at Jun. 30, 2020		30,456,493
Ending balance at Jun. 30, 2020	$ 147,559	$ 304	$ 141,297	$ 0	$ 7,846	$ (1,888)