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LONG-TERM DEBT Revolving Credit Facility Narrative (Details) - USD ($) |  | 9 Months Ended |
--- | --- | --- | ---
Jul. 13, 2018 | Sep. 30, 2018 | Dec. 31, 2017
Revolving Credit Facility [Line Items] |  |  |
Total |  | $ 107,900,000 | $ 118,756,000
Bank of America, N.A. and Wells Fargo Capital Finance, LLC |  |  |
Revolving Credit Facility [Line Items] |  |  |
Total |  | 107,900,000 | $ 95,900,000
Revolving credit facility, interest rate description | one-month |  |
Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |
Revolving Credit Facility [Line Items] |  |  |
Revolving Credit Facility, maximum borrowing capacity | $ 300,000,000 |  |
Revolving Credit Facility, maximum borrowing capacity, subject to lender approval | $ 450,000,000 |  |
Total |  | 107,900,000 |
Letters of Credit Outstanding, Amount |  | $ 6,900,000 |
London Interbank Offered Rate (LIBOR) | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |
Revolving Credit Facility [Line Items] |  |  |
Debt Instrument, basis spread on variable rate |  | 1.25% |
Revolving credit facility, additional base rate | 1.00% | 2.15% |
Line of Credit Facility, Interest Rate at Period End |  | 3.40% |
London Interbank Offered Rate (LIBOR) | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Letter of Credit |  |  |
Revolving Credit Facility [Line Items] |  |  |
Letters of credit, additional basis rate | 0.50% |  |
Base rate [Member] | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |
Revolving Credit Facility [Line Items] |  |  |
Revolving credit facility, additional base rate | 0.50% |  |
Minimum | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |
Revolving Credit Facility [Line Items] |  |  |
Revolving credit facility, unused capacity, commitment fee percentage | 0.25% |  |
Minimum | London Interbank Offered Rate (LIBOR) | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |
Revolving Credit Facility [Line Items] |  |  |
Debt Instrument, basis spread on variable rate | 1.25% |  |
Minimum | London Interbank Offered Rate (LIBOR) | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Letter of Credit |  |  |
Revolving Credit Facility [Line Items] |  |  |
Debt Instrument, basis spread on variable rate | 1.00% |  |
Minimum | Base rate [Member] | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |
Revolving Credit Facility [Line Items] |  |  |
Debt Instrument, basis spread on variable rate | 0.25% |  |
Maximum | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |
Revolving Credit Facility [Line Items] |  |  |
Revolving credit facility, unused capacity, commitment fee percentage | 0.375% |  |
Maximum | London Interbank Offered Rate (LIBOR) | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |
Revolving Credit Facility [Line Items] |  |  |
Debt Instrument, basis spread on variable rate | 2.50% |  |
Maximum | London Interbank Offered Rate (LIBOR) | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Letter of Credit |  |  |
Revolving Credit Facility [Line Items] |  |  |
Debt Instrument, basis spread on variable rate | 2.25% |  |
Maximum | Base rate [Member] | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |
Revolving Credit Facility [Line Items] |  |  |
Debt Instrument, basis spread on variable rate | 1.50% |  |
Revolving Credit Facility, Liquidity Requirement Component | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |
Revolving Credit Facility [Line Items] |  |  |
Line of credit facility, remaining borrowing capacity |  | $ 185,200,000 |

X
- Definition Fronting fee interest rate percentage for issued letters of credit, excluding interest rate spread. + References No definition available. + Details
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- Definition Line of Credit Facility, Maximum Borrowing Capacity, Subject To Lender Approval + References No definition available. + Details
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- Definition The Base Rate is the greater of the prime rate (as announced by Bank of America), the federal funds rate plus an additional rate or the 30 day LIBOR rate plus an additional rate. + References No definition available. + Details
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- Definition Description of the interest rate for the amounts borrowed under the credit facility, including the terms and the method for determining the interest rate (for example, fixed or variable, LIBOR plus a percentage, increasing rate, timing of interest rate resets, remarketing provisions). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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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