Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Abstract]
Net income (loss) attributable to RDI common stockholders	$ 902	$ 1,297	$ 1,215	$ 9,405
Weighted average number of common stock – basic	22,546,827	23,006,040	22,791,530	22,988,227
Weighted average dilutive impact of awards	141,403	191,884	161,308	196,794
Weighted average number of common stock – diluted	22,688,230	23,197,924	22,952,838	23,185,021
Basic earnings (loss) per share attributable to RDI common stockholders	$ 0.04	$ 0.06	$ 0.05	$ 0.41
Diluted earnings (loss) per share attributable to RDI common stockholders	$ 0.04	$ 0.06	$ 0.05	$ 0.41
Awards excluded from diluted earnings (loss) per share	516,010	276,681	516,010	126,840