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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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- Definition

Fronting fee interest rate percentage for issued letters of credit, excluding interest rate spread.

+ References

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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.

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Revolving credit facility borrowing limit as a percentage of eligible accounts receivable. This borrowing limit is in addition to the current liquidation value of the pledged real estate as of the reporting date for the purpose of computing the revolving credit facility borrowing limit.

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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

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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.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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-Topic 470
-SubTopic 20
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