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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).

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