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Unaudited Quarterly Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
[1]
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
[2]
Quarterly Financial Data [Abstract]                      
Revenue $ 74,990 $ 74,261 $ 84,262 $ 75,872 $ 71,841 [1] $ 66,116 $ 72,440 $ 69,481 $ 309,385 $ 279,879 $ 270,866
Net income 6,006 1,259 4,129 3,104 7,503 [1] 1,478 19,071 3,060 14,498 31,112 9,692
Net income attributable to RDI shareholders $ 4,960 $ 1,297 $ 5,027 $ 3,082 $ 7,426 [1] $ 1,576 $ 19,051 $ 3,048 $ 14,366 $ 31,101 $ 9,678
Basic earnings per share $ 0.21 $ 0.06 $ 0.22 $ 0.13 $ 0.33 [1] $ 0.07 $ 0.82 $ 0.13 $ 0.62 $ 1.35 $ 0.42
Diluted earnings per share $ 0.21 $ 0.06 $ 0.22 $ 0.13 $ 0.32 [1] $ 0.07 $ 0.81 $ 0.13 $ 0.62 $ 1.34 $ 0.41
Net tax benefit from non-recurring items of tax benefit and expense         $ 2,500            
[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).