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SHARE-BASED COMPENSATION - Additional Information (Details) |  |  |  |  | 12 Months Ended |  |
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Sep. 27, 2018 | Feb. 22, 2018 USD ($) company shares | Feb. 24, 2017 | Feb. 08, 2016 | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 shares | Jan. 07, 2015 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Unrecognized share-based compensation expense for nonvested awards |  |  |  |  | $ 25,800,000 |  |  |  |
Period for recognition of share-based compensation expense for nonvested awards |  |  |  |  | 3 years 5 months 4 days |  |  |  |
Term of share-based compensation awards |  |  |  |  | 10 years |  |  |  |
Weighted average remaining contractual term of options outstanding |  |  |  |  | 8 years 1 month 3 days |  |  |  |
Weighted average grant date fair value of options granted (in dollars per share) | $ / shares |  |  |  |  | $ 4.68 | $ 5.10 | $ 3.56 |  |
Number of options exercised (in shares) | shares |  |  |  |  | 0 | 0 | 8,501 |  |
Cash received from options exercised |  |  |  |  |  |  | $ 200,000 |  |
Intrinsic value of options exercised |  |  |  |  |  |  | $ 26,000 |  |
Intrinsic value of options outstanding |  |  |  |  | $ 0 |  |  |  |
Intrinsic value of options exercisable |  |  |  |  | $ 0 |  |  |  |
Stock Options |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expected option life | 7 years | 6 years 3 months | 6 years 3 months | 6 years 3 months |  |  |  |  |
Expected volatility | 30.42% | 32.23% | 25.06% | 23.94% |  |  |  |  |
Risk-free interest rate | 3.00% | 2.73% | 1.93% | 1.31% |  |  |  |  |
Term of share-based compensation awards |  |  |  |  | 10 years |  |  |  |
Stock Options | Minimum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 3 years |  |  |  |
Stock Options | Maximum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 5 years |  |  |  |
Restricted Stock |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of awards granted (in shares) | shares |  |  |  |  | 103,814 | 104,698 | 117,399 |  |
Weighted average grant date fair value of options granted (in dollars per share) | $ / shares |  |  |  |  | $ 21.65 | $ 27.69 | $ 24.55 |  |
Number of awards vested (in shares) | shares |  |  |  |  | 84,185 | 53,236 | 15,977 |  |
Grant date fair value of vested awards |  |  |  |  | $ 2,200,000 | $ 1,300,000 | $ 400,000 |  |
Number of unvested awards (in shares) | shares |  |  |  |  | 162,577 | 175,430 | 129,395 | 30,717 |
Restricted Stock | Minimum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  |  | 1 year |  |  |
Restricted Stock | Maximum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Award vesting period |  |  |  |  | 4 years |  |  |  |
LTIP Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of equity awards issued (in shares) | shares |  |  |  |  | 444,954 | 31,734 |  |  |
Award vesting period |  |  |  |  | 2 years |  |  |  |
Number of awards vested (in shares) | shares |  |  |  |  | 24,722 | 16,789 | 39,439 |  |
Number of unvested awards (in shares) | shares |  |  |  |  | 480,227 |  |  |  |
Weighted average remaining contractual period of nonvested awards |  |  |  |  | 4 years |  |  |  |
DSUs |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of equivalent shares per common stock (in shares) | shares |  |  |  |  | 1 |  |  |  |
Omnibus Share Plan 2015 |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of shares authorized (in shares) | shares |  |  |  |  |  |  |  |  | 15,000,000
Omnibus Share Plan 2015 | DSUs | Trustees |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | $ 200,000 |  |  |  |
Number of awards granted (in shares) | shares |  |  |  |  | 13,656 |  |  |  |
Weighted average grant date fair value of options granted (in dollars per share) | $ / shares |  |  |  |  | $ 19.33 |  |  |  |
2015 OPP | OPP Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Aggregate notional amount |  |  |  |  | $ 10,200,000 |  |  |  |
Grant date fair value of plan |  |  |  |  | $ 3,900,000 |  |  |  |
Expected volatility |  |  |  |  | 25.00% |  |  |  |
Risk-free interest rate |  |  |  |  | 1.20% |  |  |  |
2015 OPP | OPP Units | Minimum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expected daily return rate compared to peers |  |  |  |  | 19.00% |  |  |  |
2015 OPP | OPP Units | Maximum |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Expected daily return rate compared to peers |  |  |  |  | 27.00% |  |  |  |
2017 OPP | OPP Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Aggregate notional amount |  |  |  |  | $ 12,000,000 |  |  |  |
Grant date fair value of plan |  |  |  |  | $ 4,100,000 |  |  |  |
Expected volatility |  |  |  |  | 19.70% |  |  |  |
Risk-free interest rate |  |  |  |  | 1.50% |  |  |  |
2015 and 2017 OPPs | OPP Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
OPP award threshold, TSR level required |  |  |  |  | 7.00% |  |  |  |
OPP award threshold, TSR level required for multi-year period |  |  |  |  | 21.00% |  |  |  |
OPP award threshold, TSR multi-year duration |  |  |  |  | 3 years |  |  |  |
Expected dividend rate |  |  |  |  | 10.00% |  |  |  |
Expected option life |  |  |  |  | 3 years |  |  |  |
Period for recognition of nonvested awards |  |  |  |  | 5 years |  |  |  |
Share-based compensation expense |  |  |  |  | $ 1,700,000 | $ 2,000,000 | $ 1,100,000 |  |
Unrecognized share-based compensation expense for nonvested awards |  |  |  |  | $ 2,400,000 |  |  |  |
Period for recognition of share-based compensation expense for nonvested awards |  |  |  |  | 1 year 5 months 3 days |  |  |  |
2015 and 2017 OPPs | OPP Units | Year three |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting rights percentage |  |  |  |  | 50.00% |  |  |  |
2015 and 2017 OPPs | OPP Units | Year four |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting rights percentage |  |  |  |  | 25.00% |  |  |  |
2015 and 2017 OPPs | OPP Units | Year five |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Vesting rights percentage |  |  |  |  | 25.00% |  |  |  |
2018 LTI Plan |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Equity award percentage of absolute component of TSR equal to 18% |  | 18.00% |  |  |  |  |  |  |
Equity award percentage of absolute component of TSR equal to 27% |  | 27.00% |  |  |  |  |  |  |
Equity award percentage of absolute component of TSR equal to 36% |  | 36.00% |  |  |  |  |  |  |
Number of REIT peer groups | company |  | 14 |  |  |  |  |  |  |
Equity award percentage of relative component TSR equal to 35 percentile of peer group |  | 3500.00% |  |  |  |  |  |  |
Equity award percentage of relative component TSR equal to 55 percentile of peer group |  | 5500.00% |  |  |  |  |  |  |
Equity award percentage of relative component TSR equal to 75 percentile of peer group |  | 7500.00% |  |  |  |  |  |  |
2018 LTI Plan | LTIP Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Number of equity awards issued (in shares) | shares |  | 328,107 |  |  |  |  |  |  |
Equity award earned percentage based on absolute TSR component equal to 18% |  | 40.00% |  |  |  |  |  |  |
Equity award earned percentage based on absolute TSR component equal to 27% |  | 100.00% |  |  |  |  |  |  |
Equity award earned percentage based on absolute TSR component equal to 36% |  | 165.00% |  |  |  |  |  |  |
Equity award earned percentage based on relative TSR component of 35 percentile of peer group |  | 40.00% |  |  |  |  |  |  |
Equity award earned percentage based on relative TSR component of 55 percentile of peer group |  | 100.00% |  |  |  |  |  |  |
Equity award earned percentage based on relative TSR component of 75 percentile of peer group |  | 165.00% |  |  |  |  |  |  |
2018 LTI Plan | Performance-Based Shares |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
OPP award threshold, TSR multi-year duration |  | 3 years |  |  |  |  |  |  |
Grant date fair value of plan |  | $ 3,600,000 |  |  |  |  |  |  |
Weighted percentage of equity awards |  | $ 0.8 |  |  |  |  |  |  |
Equity award earned percentage based on absolute TSR component equal to 18% |  | 25.00% |  |  |  |  |  |  |
Equity award earned percentage based on relative TSR component of 35 percentile of peer group |  | 75.00% |  |  |  |  |  |  |
2018 LTI Plan | Time-Based Shares |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Grant date fair value of plan |  | $ 700,000 |  |  |  |  |  |  |
Weighted percentage of equity awards |  | $ 0.2 |  |  |  |  |  |  |
Number of awards granted (in shares) | shares |  | 33,172 |  |  |  |  |  |  |
2018 LTI Plan | Time-Based Shares | Board of Directors Chairman |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Award vesting period |  | 3 years |  |  |  |  |  |  |
2018 LTI Plan | Time-Based Shares | Chief Executive Officer |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Award vesting period |  | 4 years |  |  |  |  |  |  |
2018 Inducement Equity Plan | Stock Options |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Grant date fair value of plan |  |  |  |  | $ 9,300,000 |  |  |  |
Number of awards granted (in shares) | shares |  |  |  |  | 2,000,000 |  |  |  |
2018 Inducement Equity Plan | Restricted LTIP Units |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |
Grant date fair value of plan |  |  |  |  | $ 7,200,000 |  |  |  |
Number of awards granted (in shares) | shares |  |  |  |  | 352,890 |  |  |  |

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109197908&loc=SL79508275-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109223946&loc=d3e3255-108585 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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