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DEBT OBLIGATIONS - Narrative (Details) |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 13, 2018 USD ($) | Dec. 12, 2018 | Jul. 17, 2018 USD ($) extension | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Oct. 10, 2019 USD ($)
Guaranteed Notes Due 2029 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 100,000,000.0
Debt instrument, interest rate, stated percentage |  |  |  |  |  | 4.55%
Debt instrument, premium, percentage of face amount |  |  |  |  |  | 110.058%
Net original issue premium |  |  |  |  | $ 8,500,000 |
Guaranteed Notes Due 2024 |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  | 4.10%
Debt instrument, premium, percentage of face amount |  |  |  |  |  | 106.315%
Net original issue premium |  |  |  |  | $ 5,300,000 |
Revolving Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Line of credit |  |  |  | $ 0 |  |
Long-term debt, weighted average interest rate |  |  |  | 1.48% | 3.52% |
Interest expense borrowings |  |  |  | $ 500,000 | $ 4,400,000 |
Revolving Credit Facility | 2018 Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, number of extensions | extension |  |  | 2 |  |  |
Debt instrument, extension term duration |  |  | 6 months |  |  |
Debt financing costs |  |  | $ 2,700,000 |  |  |
Minimum credit Spread on a LIBOR rate loan |  |  |  | 0.00% |  |
Maximum credit spread on a LIBOR rate Loan |  |  |  | 0.45% |  |
Commitment fee percentage |  |  |  | 0.25% |  |
Minimum fixed charge coverage ratio |  |  |  | 1.5 |  |
Maximum leverage ratio |  |  |  | 0.60 |  |
Maximum unsecured indebtedness to unencumbered asset value ratio |  |  |  | 0.60 |  |
Maximum secured indebtedness to total asset value ratio |  |  |  | 0.40 |  |
Minimum unencumbered cash flow to interest expense on unsecured debt ratio |  |  |  | 1.75 |  |
Maximum percent of payments of dividends and distributions |  |  |  | 95.00% |  |
Revolving Credit Facility | 2018 Credit Facility | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Commitment fee percentage |  |  |  | 0.125% |  |
Revolving Credit Facility | 2018 Credit Facility | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Commitment fee percentage |  |  |  | 0.30% |  |
Revolving Credit Facility | 2018 Credit Facility | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Variable interest rate |  |  |  | 1.10% |  |
Basis spread on variable rate |  |  |  | 1.00% |  |
Revolving Credit Facility | 2018 Credit Facility | LIBOR | Minimum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Variable interest rate |  |  |  | 0.775% |  |
Revolving Credit Facility | 2018 Credit Facility | LIBOR | Maximum |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Variable interest rate |  |  |  | 1.45% |  |
Revolving Credit Facility | 2018 Credit Facility | Federal Funds Rate |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Basis spread on variable rate |  |  |  | 0.50% |  |
Unsecured Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Long-term debt, gross |  |  |  | $ 1,828,610,000 | 1,828,610,000 |
Unsecured Debt | Seven-Year Term Loan - Swapped to fixed |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, interest rate, stated percentage | 2.87% |  |  |  |  |
Long-term debt, gross | $ 250,000,000.0 |  |  | $ 250,000,000 | 250,000,000 |
Debt instrument, term | 7 years |  |  | 7 years |  |
Decrease in interest rate | (0.55%) |  |  |  |  |
Unsecured Debt | Seven-Year Term Loan - Swapped to fixed | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Variable interest rate | 1.25% | 1.80% |  |  |  |
Unsecured Debt | $600 million Unsecured Credit Facility |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Debt instrument, face amount |  |  |  | $ 600,000,000 |  |
Long-term debt, gross |  |  |  | $ 0 | $ 0 |
Maximum borrowing capacity |  |  | $ 600,000,000.0 |  |  |
Unsecured Debt | $600 million Unsecured Credit Facility | LIBOR |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Variable interest rate |  |  |  | 1.10% |  |

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