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DEBT OBLIGATIONS - Narrative (Details) |  |  |  | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 13, 2018 | Dec. 12, 2018 | Jul. 17, 2018 USD ($) extension | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 shares | Oct. 10, 2019 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |
Line of credit |  |  |  | $ 0 | $ 92,500,000 |  |
Repurchased and retired (in shares) | shares |  |  |  | 1,337,169 | 1,729,278 | 0 |
Guaranteed Notes Due 2024 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  | 4.10%
Debt instrument, face amount |  |  |  |  |  |  | $ 100,000,000.0
Debt instrument, premium, percentage of face amount |  |  |  |  |  |  | 106.315%
Debt instrument, unamortized premium |  |  |  | $ 5,300,000 |  |  |
Guaranteed Notes Due 2029 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, interest rate, stated percentage |  |  |  |  |  |  | 4.55%
Debt instrument, face amount |  |  |  |  |  |  | $ 100,000,000.0
Debt instrument, premium, percentage of face amount |  |  |  |  |  |  | 110.058%
Debt instrument, unamortized premium |  |  |  | $ 8,500,000 |  |  |
Revolving Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Long-term debt, weighted average interest rate |  |  |  | 3.52% | 3.24% |  |
Line of credit |  |  |  | $ 0 | $ 92,500,000 |  |
Interest expense borrowings |  |  |  | $ 4,400,000 | $ 1,000,000.0 |  |
Revolving Credit Facility | 2018 Credit Facility |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt instrument, number of extensions | extension |  |  | 2 |  |  |  |
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 | Seven-Year Term Loan - Swapped to fixed |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
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] |  |  |  |  |  |  |
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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- Definition Maximum credit spread on LIBOR based loans. + References No definition available. + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs classified as noncurrent. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + 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 210.5-02.17) -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 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28555-108399 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + 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(22)) -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 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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