Earnings Per Share (Computation Of Basic And Diluted Earnings (Loss) Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income (loss) attributable to RDI common stockholders	$ (10,095)	$ (19,228)	$ 31,572	$ (47,806)
Weighted average number of common stock – basic	21,809,402	21,748,531	21,792,007	21,749,146
Weighted average dilutive impact of awards			670,650
Weighted average number of common stock – diluted	21,809,402	21,748,531	22,462,657	21,749,146
Basic earnings (loss) per share attributable to RDI common stockholders	$ (0.46)	$ (0.88)	$ 1.45	$ (2.20)
Diluted earnings (loss) per share attributable to RDI common stockholders	$ (0.46)	$ (0.88)	$ 1.41	$ (2.20)
Awards excluded from diluted earnings (loss) per share	492,344	674,676	517,344	674,676