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LONG-TERM DEBT (Narrative) (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 01, 2014
Line of Credit Facility [Line Items] |  |  |
Line of Credit Facility, Current Borrowing Capacity | $ 63,600,000.0 |  |
Line of Credit Facility, Maximum Borrowing Capacity |  |  | $ 75,000,000.0
Prime Rate [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Spread On Variable Rate Credit Facility | 0.25% | 0.25% |
LIBOR Rate [Member] |  |  |
Line of Credit Facility [Line Items] |  |  |
Spread On Variable Rate Credit Facility | 1.25% | 1.25% |

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- Definition Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + 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 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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