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REVOLVING FACILITY AND DEFERRED FINANCING COSTS (Narrative) (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 | Dec. 20, 2017 | Dec. 31, 2016
Disclosure of detailed information about borrowings [line items] |  |  |
Deferred financing costs and other long term assets | $ 2,817,000 |  | $ 2,416,000
Revolving Facility [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings, interest rate basis | LIBOR |  |
Borrowings required leverage ratio | 3.50 |  |
Borrowings required leverage ratio under permitted acquisition | 4.00 |  |
Borrowing covenants tangible net worth threshold | $ 136,800,000 |  |
Borrowings convenants positive net income percentage per quarter | 50.00% |  |
Borrowings | $ 0 |  |
Deferred financing costs and other long term assets | $ 2,300,000 |  | $ 1,900,000
Revolving Facility [member] | Bottom of range [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings, adjustment to interest rate basis | 2.50% |  |
Revolving Facility [member] | Top of range [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings, adjustment to interest rate basis | 3.50% |  |
Revolving Facility [member] | Floating interest rate [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Undrawn borrowing facilities |  | $ 150,000,000 |
Revolving Facility [member] | Floating interest rate [member] | Bottom of range [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings standby fee percentage | 0.60% |  |
Revolving Facility [member] | Floating interest rate [member] | Top of range [member] |  |  |
Disclosure of detailed information about borrowings [line items] |  |  |
Borrowings standby fee percentage | 0.80% |  |

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