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SHARE-BASED COMPENSATION - Outperformance Plan (Details) - 2017 OPP - OPP Units
$ in Millions
Feb. 24, 2017
USD ($)
company
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Aggregate notional amount $ 12.0
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
Number of REIT peer groups | company 14
Expected dividend rate 10.00%
Grant date fair value of plan $ 4.1
Fair value assumptions, expected term 3 years
Fair value assumptions, historic volatility rate 19.70%
Fair value assumptions, risk-free interest rate 1.50%
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized, Period for Recognition From Grant Date 5 years
Year three  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting rights percentage 50.00%
Year four  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting rights percentage 25.00%
Year five  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Vesting rights percentage 25.00%