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FAIR VALUE MEASUREMENTS (Details) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2018 | Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Investments for contractual obligations |  | $ 12,514 | $ 12,393
Derivative Asset |  | 208 | 458
Other Assets, Fair Value Disclosure | $ 124 | 124 | 154
Assets, Fair Value Disclosure |  | 12,846 | 13,005
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Preferred stock at beginning of period | 154 |  |
Preferred stock at end of period | 124 |  |
Fair Value, Inputs, Level 1 [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Investments for contractual obligations |  | 12,514 | 12,393
Derivative Asset |  | 0 | 0
Other Assets, Fair Value Disclosure | 0 | 0 | 0
Assets, Fair Value Disclosure |  | 12,514 | 12,393
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Preferred stock at beginning of period | 0 |  |
Preferred stock at end of period | 0 |  |
Fair Value, Inputs, Level 2 [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Investments for contractual obligations |  | 0 | 0
Derivative Asset |  | 208 | 458
Other Assets, Fair Value Disclosure | 0 | 0 | 0
Assets, Fair Value Disclosure |  | 208 | 458
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Preferred stock at beginning of period | 0 |  |
Preferred stock at end of period | 0 |  |
Fair Value, Inputs, Level 3 [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Investments for contractual obligations |  | 0 | 0
Derivative Asset |  | 0 | 0
Other Assets, Fair Value Disclosure | 154 | 124 | 154
Assets, Fair Value Disclosure |  | $ 124 | $ 154
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |
Preferred stock at beginning of period | 154 |  |
Assets, Fair Value Adjustment | (30) |  |
Preferred stock at end of period | $ 124 |  |

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13433-108611 Reference 4: 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 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=77997519&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=82849420&loc=SL20226008-175313 + Details
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