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)	0	(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
Bad debt expense	22
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, 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)
Common stock cash dividend declared (in dollars per share)	$ 0.10
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)	(1,649,768)
Share repurchases	$ (31,341)			(31,341)
Bad debt expense	1,277
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)