Earnings Per Share (Computation Of Basic And Diluted Earnings (Loss) Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Earnings Per Share [Abstract]
Net income (loss) attributable to RDI common stockholders	$ (22,702)	$ 2,331	$ (28,577)	$ 207
Weighted average shares of common stock – basic	21,742,667	22,894,083	21,749,356	22,901,764
Weighted average dilutive impact of awards	352,469	165,650	352,859	172,909
Weighted average number of common stock – diluted	22,095,136	23,059,733	22,102,215	23,074,673
Basic earnings (loss) per share attributable to RDI common stockholders	$ (1.04)	$ 0.10	$ (1.31)	$ 0.01
Diluted earnings (loss) per share attributable to RDI common stockholders	$ (1.04)	$ 0.10	$ (1.31)	$ 0.01
Awards excluded from diluted earnings (loss) per share	678,377	516,010	703,377	516,010