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Earnings Per Share (Computation Of Basic And Diluted Earnings Per Share) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
[1]
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
[1]
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Earnings Per Share [Abstract]                      
Net income attributable to RDI common stockholders $ 7,382 $ 1,556 $ 19,032 $ 3,029 $ 352 $ 3,855 $ 2,970 $ 2,226 $ 30,999 $ 9,403 [2] $ 23,110 [2]
Weighted average number of common stock – basic                 23,041,190 23,320,048 [2] 23,293,696 [2]
Weighted average dilutive impact of awards                 206,779 201,109 201,922
Weighted average number of common stock – diluted                 23,247,969 23,521,157 [2] 23,495,618 [2]
Basic EPS attributable for RDI common stockholders $ 0.33 $ 0.07 $ 0.82 $ 0.13 $ 0.01 $ 0.17 $ 0.13 $ 0.09 $ 1.35 $ 0.40 [2] $ 0.99 [2]
Diluted EPS attributable to RDI common stockholders $ 0.32 $ 0.07 $ 0.81 $ 0.13 $ 0.02 $ 0.16 $ 0.13 $ 0.09 $ 1.33 $ 0.40 [2] $ 0.98 [2]
Awards excluded from diluted EPS                 149,841 92,500  
[1] Net income for the 4th quarter of 2017 includes approximately $2.5 million net tax benefit from non-recurring items of tax benefit and expense related to the Tax Cuts and Jobs Act enacted December 2017 and dissolution of a non-operating foreign subsidiary.
[2] Certain prior year balances have been reclassified to conform to the 2017 presentation (see Note 2 - Summary of Significant Accounting Policies - Reclassifications).