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REAL ESTATE INVESTMENTS - Pro Forma (Details) - DRA Austin Venture - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |
Pro forma revenue | $ 602,713 | $ 582,244
Pro forma net income | 134,142 | 115,475
Pro forma net income available to common shareholders | $ 134,142 | $ 115,475

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