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EARNINGS PER SHARE AND UNIT AND SHAREHOLDERS' EQUITY AND CAPITAL - Common and Preferred Shares (Details) - USD ($) $ / shares in Units, shares in Thousands |  | 12 Months Ended
--- | --- | ---
Nov. 02, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Issuance of Common and Preferred Shares |  |  |  |
Series A Cumulative Redeemable Preferred, redeemed |  |  | $ 77,574,000 |
Net proceeds from sale of common shares |  | $ 29,642,000 | $ 136,121,000 | $ 234,061,000
Equity Distribution Agreements | Maximum |  |  |  |
Issuance of Common and Preferred Shares |  |  |  |
Number of shares that may be sold |  | 40,000 |  |
Common Shares | Equity Distribution Agreements |  |  |  |
Issuance of Common and Preferred Shares |  |  |  |
Number of common stock sold (in shares) |  | 1,036 | 4,408 | 8,977
Average sales price per common share (in dollars per share) |  | $ 29.13 | $ 31.25 | $ 26.35
Net proceeds from sale of common shares |  | $ 29,642,000 | $ 136,120,000 | $ 234,240,000
Common shares remained available for issuance |  | 4,700 | 5,800 | 10,200
Series A |  |  |  |
Issuance of Common and Preferred Shares |  |  |  |
Series A Cumulative Redeemable Preferred, shares redeemed | 3,100 |  |  |
Series A Cumulative Redeemable Preferred shares, percentage | 7.75% |  |  |
Series A Cumulative Redeemable Preferred, redeemed | $ 77,500,000 |  |  |
Series A Cumulative Redeemable Preferred shares, redemption price (in dollars per share) | $ 25.00 |  |  |
Series A Cumulative Redeemable Preferred shares, dividend (in dollars per share) | $ 0.17374 |  |  |
Series A Preferred shares, percentage | 7.75% |  |  |

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