ACCOUNTS RECEIVABLE SECURITIZATION (Details) - Line of Credit - Accounts Receivable Securitization Facility - USD ($)	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Short-term Debt [Line Items]
Maximum borrowing capacity	$ 100,000,000
Security facility program fee (as a percent)	4.00%
Unused commitment fee (as a percent)	0.60%
Accounts receivable eligible for securitization	$ 61,398,000	$ 60,582,000
Outstanding borrowings	0	0
Letters of credit outstanding	61,398,000	60,582,000
Borrowings and issuance of letters of credit remaining capacity	0	$ 0
Costs associated with receivables facility	$ 666,000