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ACQUISITIONS - Unaudited Supplemental Pro Forma Consolidated Revenue and Net Income (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019
Dover Downs |  |
Business Acquisition [Line Items] |  |
Revenue | $ 546,634 | $ 534,140
Net income | 61,945 | 62,792
Net income applicable to common stockholders | $ 61,945 | $ 63,432
Net income per share, basic (in dollars per share) | $ 1.64 | $ 1.59
Net income per share, diluted (in dollars per share) | $ 1.64 | $ 1.53
Casino KC, Casino Vicksburg, and Shreveport |  |
Business Acquisition [Line Items] |  |
Revenue | $ 465,685 | $ 722,136
Net income | $ (7,450) | $ 92,713
Net income per share, basic (in dollars per share) | $ (0.24) | $ 2.46
Net income per share, diluted (in dollars per share) | $ (0.24) | $ 2.45

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