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SHAREHOLDERS' EQUITY AND PARTNERS' CAPITAL (Common Stock and Common Units) (Details) - $ / shares | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Operating Partnership |  |
Shareholders Equity [Line Items] |  |
Common units outstanding (in shares) | 199,297,151 | 199,085,032
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, shares authorized (in shares) | 350,000,000 |
Common stock, par value (in dollars per share) | $ 0.01 |
Common stock, shares outstanding (in shares) | 171,088,778 | 170,792,645

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