LONG-TERM DEBT Long-Term Debt - ABL Facility (Details) - ABL Facility [Member] - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 15, 2016
Line of Credit Facility [Line Items]
Line of Credit Facility, Borrowing Capacity, Description	The ABL Facility provides the ABL Borrowers with the ability to borrow up to an aggregate principal amount equal to the lesser of (i) the aggregate revolving commitments then in effect and (ii) the sum of  85% of the value of eligible accounts receivable plus (b) 80% of the value of eligible unbilled accounts receivable, subject to a limit equal to the greater of (x) $35 million and (y) 25% of the Commitments.
Debt Instrument, Description of Variable Rate Basis	Borrowings under the ABL Facility will bear interest, at the ABL Borrowers’ option, at a per annum rate equal to (i) LIBOR for 30, 60, 90, 180, or, with the consent of the ABL Lenders, 360 days, plus an applicable margin that varies from 2.5% to 4.5% depending on the Borrowers’ fixed charge coverage ratio at such time or (ii) a base rate equal to the sum of (a) the greatest of (x) the prime rate, (y) the federal funds rate, plus 0.50% or (z) 30-day LIBOR, plus 1.0% plus (b) an applicable margin that varies from 1.50% to 3.50% depending on the Borrowers’ fixed charge coverage ratio at such time.
Debt Instrument, Maturity Date	Jun. 15, 2021
Line of Credit Facility, Maximum Borrowing Capacity	$ 100.0	$ 80.0
Eligible Accounts Receivable for ABL Facility Borrowings	85.00%
Eligible Unbilled Accounts Receivable For ABL Facility Borrowings	80.00%
Maximum Eligible Unbilled Accounts Receivable For ABL Facility Borrowings	$ 35.0
Maximum Percent Of Commitment For ABL Facility Borrowings	25.00%
Long-term Line of Credit, Noncurrent	$ 0.0
Letters of Credit Outstanding, Amount	34.8
Line of Credit Facility, Remaining Borrowing Capacity	$ 24.0
Maximum
Line of Credit Facility [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	1.25%
Minimum
Line of Credit Facility [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	1.00%
fixed charge coverage ratio	1.00
Federal Funds rate, plus 0.50% [Member] | Maximum
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	3.50%
Federal Funds rate, plus 0.50% [Member] | Minimum
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Federal Funds [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	0.50%
30-day LIBOR [Member]
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Prime Rate [Member] | Maximum
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	3.50%
Prime Rate [Member] | Minimum
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%
London Interbank Offered Rate (LIBOR) [Member] | Maximum
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	4.50%
London Interbank Offered Rate (LIBOR) [Member] | Minimum
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	2.50%
30-day LIBOR, plus 1.0% [Member] | Maximum
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	3.50%
30-day LIBOR, plus 1.0% [Member] | Minimum
Line of Credit Facility [Line Items]
Debt Instrument, Basis Spread on Variable Rate	1.50%