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DERIVATIVE FINANCIAL INSTRUMENTS AND HEDGING - Schedule of derivative financial instruments (Details) - Designated as hedges - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Interest rate swaps |  |
Derivative financial instruments and hedging |  |
Notional Amount | $ 475,000 | $ 275,000
Fair Value | 5,425 | 1,319
Interest Rate Swap Expiring October 1, 2018 |  |
Derivative financial instruments and hedging |  |
Notional Amount | 75,000 | 75,000
Fair Value | $ 14 | (190)
Derivative average fixed interest rate | 2.04% |
Interest Rate Swap Expiring January 31, 2023 |  |
Derivative financial instruments and hedging |  |
Derivative average fixed interest rate | 1.98% |
Interest Rate Swap Expiring January 31, 2023 One |  |
Derivative financial instruments and hedging |  |
Notional Amount | $ 100,000 | 100,000
Fair Value | 3,231 | 722
Interest Rate Swap Expiring January 31, 2023 Two |  |
Derivative financial instruments and hedging |  |
Notional Amount | 100,000 | 100,000
Fair Value | 3,299 | 787
Interest Rate Swap Expiring September 30, 2024 |  |
Derivative financial instruments and hedging |  |
Notional Amount | 75,000 | 0
Fair Value | $ (347) | 0
Derivative average fixed interest rate | 2.87% |
Interest Rate Swap Expiring December 31, 2025 |  |
Derivative financial instruments and hedging |  |
Notional Amount | $ 125,000 | 0
Fair Value | $ (772) | $ 0
Derivative average fixed interest rate | 2.93% |

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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 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 fixed interest rate related to the group of interest rate derivatives. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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