Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Net income attributable to RDI common stockholders	$ 3,047	$ 3,029	[1]
Weighted average number of common stock – basic	22,967,237	23,168,351	[1]
Weighted average dilutive impact of awards	165,752	296,825
Weighted average number of common stock – diluted	23,132,989	23,465,176	[1]
Basic EPS attributable for RDI common stockholders	$ 0.13	$ 0.13	[1]
Diluted EPS attributable to RDI common stockholders	$ 0.13	$ 0.13	[1]
Awards excluded from diluted EPS

[1] Certain prior year balances have been reclassified to conform to the 2018 presentation (see Note 2 - Summary of Significant Accounting Policies - Reclassifications).