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SHAREHOLDERS' EQUITY AND PARTNERS' CAPITAL - Common Stock and Common Units (Details) - $ / shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017
Operating Partnership |  |
Shareholders Equity [Line Items] |  |
Common units outstanding (shares) | 199,414,863 | 199,297,151
Operating Partnership | Common Units |  |
Shareholders Equity [Line Items] |  |
Noncontrolling interest conversion, calculation of trailing average of trading price, term (days) | 5 days |
Common Stock |  |
Shareholders Equity [Line Items] |  |
Common stock authorized (shares) | 350,000,000 |
Common stock, par value (USD per share) | $ 0.01 |
Common stock outstanding (shares) | 172,656,458 | 171,088,778

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