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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING ACTIVITIES - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2014
Derivative [Line Items] |  |  |
Notional amount | $ 100,033 | $ 130,205 |
Derivative asset (liability), fair value | 1,171 | 447 |
Interest rate caps agreements |  |  |
Derivative [Line Items] |  |  |
Premiums paid |  |  | $ 4,600
Cap interest rate |  |  | 3.00%
Effective percentage interest rate, maximum |  |  | 3.00%
Cash Flow Hedges | Designated as Hedging Instrument |  |  |
Derivative [Line Items] |  |  |
Notional amount | $ 90,000 | $ 90,000 |
Remaining weighted average maturity | 4 years 10 months 13 days | 5 years 1 month 6 days |
Derivative asset (liability), fair value | $ 1,215 | $ 669 |
Cash Flow Hedges | Designated as Hedging Instrument | Interest rate caps agreements |  |  |
Derivative [Line Items] |  |  |
Notional amount | $ 90,000 | $ 90,000 |
Remaining weighted average maturity | 4 years 10 months 13 days | 5 years 1 month 6 days |
Derivative asset (liability), fair value | $ 1,215 | $ 669 |

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- Definition Derivative, Premium + References No definition available. + Details
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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Fair values as of the balance sheet date of the net amount of all assets and liabilities resulting from contracts that meet the criteria of being accounted for as derivative instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 + Details
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- Definition Average remaining period until maturity of the derivative contract, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Cap rate on an interest rate derivative such as an interest rate cap or collar. If market rates exceed the cap rate, a payment or receipt is triggered on the contract. + References No definition available. + Details
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