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DEBT - Narrative (Details) |  |  |  |  | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
May 16, 2018 USD ($) | Apr. 02, 2018 USD ($) Loan | Feb. 15, 2018 USD ($) | Sep. 26, 2017 USD ($) | Jun. 30, 2018 USD ($) Property | Dec. 31, 2017 USD ($) | Jun. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) | Jan. 15, 2016 USD ($) | Apr. 08, 2015 USD ($) | Apr. 07, 2015 USD ($) | Sep. 05, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Weighted average interest rate for all borrowings, after giving effect to interest rate derivatives (as a percent) |  |  |  |  | 4.20% |  |  | 3.89% |  |  |  |
Number of properties that served as collateral for loans | Property |  |  |  |  | 51 |  |  |  |  |  |  |
Principal payments on debt |  |  |  |  | $ 337,297,000 |  | $ 178,178,000 |  |  |  |  |
Long-term debt |  |  |  |  | 950,497,000 | $ 868,236,000 |  | $ 868,236,000 |  |  |  |
Secured and unsecured debt | Total term loans |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  | 910,800,000 |  |  |  |  |  |  |
Secured debt | Total term loans |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term debt |  |  |  |  | 310,800,000 |  |  |  |  |  |  |
Secured debt | Non-recourse Loan | Metabank |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 47,600,000.0 |  |  |  |  |
Amount drawn on secured debt |  |  |  |  |  | $ 47,600,000 |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  | 4.44% |  | 4.44% |  |  |  |
Debt instrument, interest only payments term |  |  |  |  |  |  |  | 18 months |  |  |  |
Debt instrument, amortization period after interest only payments period |  |  |  |  |  |  |  | 25 years |  |  |  |
Unsecured debt | $450 Million Senior Unsecured Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | 450,000,000.0 | $ 450,000,000.0 |  | $ 450,000,000.0 |  |  |  |
Maximum borrowing capacity |  |  |  |  | 450,000,000.0 |  |  |  | $ 450,000,000.0 |  |  |
Maximum increase in borrowing capacity available through accordion feature option |  |  |  |  | 150,000,000.0 |  |  |  |  |  |  |
Unsecured debt | $300 Million Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  | 300,000,000.0 |  |  |
Amount available for borrowing |  |  |  |  | 255,000,000 |  |  |  |  |  |  |
Long-term debt |  |  |  |  | $ 45,000,000 |  |  |  |  |  |  |
Unsecured debt | $150 Million Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  | $ 150,000,000 |  |  |
Fixed interest rate |  |  |  |  | 3.79% |  |  |  |  |  |  |
Long-term debt |  |  |  |  | $ 150,000,000 |  |  |  |  |  |  |
Unsecured debt | 2015 Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  |  | $ 140,000,000.0 | $ 125,000,000.0 |
Principal payments on debt |  |  | $ 140,000,000 |  |  |  |  |  |  |  |  |
Unsecured debt | 2017 Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 225,000,000.0 |  |  |  |  |  |  |  |
Maximum increase in borrowing capacity available through accordion feature option |  |  |  | $ 175,000,000.0 |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  |  |  |  | 3.84% |  |  |  |  |  |  |
Unsecured debt | 2018 Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  | 225,000,000.0 |  |  |  |  |  |  |  |  |
Maximum increase in borrowing capacity available through accordion feature option |  |  | 150,000,000.0 |  |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  |  |  |  | 4.14% |  |  |  |  |  |  |
Amount drawn on unsecured debt | $ 85,000,000 |  | $ 140,000,000 |  |  |  |  |  |  |  |  |
Mortgage loans | Western Alliance Bank |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  | 5.39% |  |  |  |  |  |  |  |  |  |
Principal payments on debt |  | $ 23,900,000 |  |  |  |  |  |  |  |  |  |
Number of debt instrument | Loan |  | 4 |  |  |  |  |  |  |  |  |  |
Option One | Minimum | LIBOR | Unsecured debt | 2017 Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt basis spread on variable rate |  |  |  | 1.45% |  |  |  |  |  |  |  |
Option One | Minimum | LIBOR | Unsecured debt | 2018 Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt basis spread on variable rate |  |  | 1.80% |  |  |  |  |  |  |  |  |
Option One | Maximum | LIBOR | Unsecured debt | 2017 Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt basis spread on variable rate |  |  |  | 2.20% |  |  |  |  |  |  |  |
Option One | Maximum | LIBOR | Unsecured debt | 2018 Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt basis spread on variable rate |  |  | 2.55% |  |  |  |  |  |  |  |  |
Option Two | LIBOR | Unsecured debt | 2017 Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt basis spread on variable rate |  |  |  | 1.00% |  |  |  |  |  |  |  |
Option Two | LIBOR | Unsecured debt | 2018 Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt basis spread on variable rate |  |  | 1.00% |  |  |  |  |  |  |  |  |
Option Two | Federal Funds Rate | Unsecured debt | 2017 Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt basis spread on variable rate |  |  |  | 0.50% |  |  |  |  |  |  |  |
Option Two | Federal Funds Rate | Unsecured debt | 2018 Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt basis spread on variable rate |  |  | 0.50% |  |  |  |  |  |  |  |  |
Option Two | Minimum | Base rate | Unsecured debt | 2017 Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt basis spread on variable rate |  |  |  | 0.45% |  |  |  |  |  |  |  |
Option Two | Minimum | Base rate | Unsecured debt | 2018 Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt basis spread on variable rate |  |  | 0.80% |  |  |  |  |  |  |  |  |
Option Two | Maximum | Base rate | Unsecured debt | 2017 Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt basis spread on variable rate |  |  |  | 1.20% |  |  |  |  |  |  |  |
Option Two | Maximum | Base rate | Unsecured debt | 2018 Term Loan |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt basis spread on variable rate |  |  | 1.55% |  |  |  |  |  |  |  |  |
Designated as hedges | Interest rate swaps |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  | $ 475,000,000 | 275,000,000 |  | 275,000,000 |  |  |  |
Designated as hedges | Cash flow hedges | Interest rate swaps |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Notional Amount |  |  |  |  |  |  |  |  |  |  |  | $ 75,000,000.0
Designated as hedges | Cash flow hedges | Interest rate swaps | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  | 2.04% |  |  |  |  |  |  |
Revolving Credit Facility |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, effective interest rate |  |  |  |  | 3.89% |  |  |  |  |  |  |
Revolving Credit Facility | Option One | Minimum | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt basis spread on variable rate |  |  |  |  | 1.50% |  |  |  |  |  |  |
Revolving Credit Facility | Option One | Maximum | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt basis spread on variable rate |  |  |  |  | 2.25% |  |  |  |  |  |  |
Revolving Credit Facility | Option Two | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt basis spread on variable rate |  |  |  |  | 1.00% |  |  |  |  |  |  |
Revolving Credit Facility | Option Two | Federal Funds Rate |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt basis spread on variable rate |  |  |  |  | 0.50% |  |  |  |  |  |  |
Revolving Credit Facility | Option Two | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, base rate margin |  |  |  |  | 0.50% |  |  |  |  |  |  |
Revolving Credit Facility | Option Two | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, base rate margin |  |  |  |  | 1.25% |  |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Debt with variable interest rates that had been converted to fixed interest rates |  |  |  |  | $ 275,000,000 | $ 75,000,000 |  | $ 75,000,000 |  |  |  |

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