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SHAREHOLDERS' EQUITY AND PARTNERS' CAPITAL - Common Stock Repurchase Program (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) unitholder shares | Dec. 31, 2017 USD ($) unitholder shares | Dec. 31, 2016 USD ($) unitholder shares
Class of Stock [Line Items] |  |  |
Value of redemption of units | $ | $ 2,246 | $ 656 | $ 11,754
Number of holders of common units who received cash for their units (unitholder) | unitholder | 2 | 5 | 4
Redeemable noncontrolling interest, units exercised for conversion (shares) | 526,510 | 84,014 | 964,796
Operating Partnership |  |  |
Class of Stock [Line Items] |  |  |
Redeemable noncontrolling interest, units exercised for conversion (shares) | 915,338 |  |
Redeemable noncontrolling interest, shares issued upon exercise of common units (shares) | 915,338 |  |

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- Definition Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(28)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(29)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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