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LONG-TERM DEBT Revolving Credit Facility Narrative (Details) - USD ($) | Jul. 13, 2018 | Jun. 30, 2014 | Jul. 01, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Revolving Credit Facility [Line Items] |  |  |  |
Total |  |  | $ 117,199,000 | $ 118,756,000
Bank of America, N.A. and Wells Fargo Capital Finance, LLC |  |  |  |
Revolving Credit Facility [Line Items] |  |  |  |
Total |  |  | $ 117,199,000 | $ 95,900,000
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 |  | $ 300,000,000.0 |  |
Percent of Eligible Billed Accounts Receivable | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |  |
Revolving Credit Facility [Line Items] |  |  |  |
Revolving credit facility borrowing limits, percent of accounts receivable |  | 90.00% |  |
Percent of Eligible Unbilled Accounts Receivable | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |  |
Revolving Credit Facility [Line Items] |  |  |  |
Revolving credit facility borrowing limits, percent of accounts receivable |  | 85.00% |  |
Percent of Eligible Accounts Receivable | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Revolving Credit Facility |  |  |  |
Revolving Credit Facility [Line Items] |  |  |  |
Revolving credit facility borrowing limits, percent of accounts receivable |  | 15.00% |  |
Subsequent Event [Member] | Bank of America, N.A. and Wells Fargo Capital Finance, LLC |  |  |  |
Revolving Credit Facility [Line Items] |  |  |  |
Revolving credit facility, interest rate description | one-month |  |  |
Subsequent Event [Member] | 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 |  |  |
Subsequent Event [Member] | London Interbank Offered Rate (LIBOR) | 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 | 1.00% |  |  |
Subsequent Event [Member] | London Interbank Offered Rate (LIBOR) | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Letter of Credit [Member] |  |  |  |
Revolving Credit Facility [Line Items] |  |  |  |
Letters of credit, additional basis rate | 0.50% |  |  |
Subsequent Event [Member] | 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% |  |  |
Subsequent Event [Member] | 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% |  |  |
Subsequent Event [Member] | 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% |  |  |
Subsequent Event [Member] | Minimum | London Interbank Offered Rate (LIBOR) | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Letter of Credit [Member] |  |  |  |
Revolving Credit Facility [Line Items] |  |  |  |
Debt Instrument, basis spread on variable rate | 1.00% |  |  |
Subsequent Event [Member] | 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% |  |  |
Subsequent Event [Member] | 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% |  |  |
Subsequent Event [Member] | 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% |  |  |
Subsequent Event [Member] | Maximum | London Interbank Offered Rate (LIBOR) | Bank of America, N.A. and Wells Fargo Capital Finance, LLC | Letter of Credit [Member] |  |  |  |
Revolving Credit Facility [Line Items] |  |  |  |
Debt Instrument, basis spread on variable rate | 2.25% |  |  |
Subsequent Event [Member] | 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% |  |  |

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