CREDIT CONCENTRATION (Details) - USD ($) $ in Thousands	2 Months Ended	12 Months Ended
	Mar. 15, 2017	Dec. 31, 2016	Dec. 31, 2017	Jan. 31, 2017	Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable from customers, current		$ 69,721			$ 67,882
Accounts receivable, net, noncurrent		$ 37,984			$ 0
Customer A
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage		36.00%
Customer A | Tax Credits | State of Alaska
Accounts, Notes, Loans and Financing Receivable [Line Items]
Tax credits assigned as collateral for accounts receivable		$ 30,200
Tax credits assigned as collateral for accounts receivable subject to monetization		24,400
Tax credits assigned as collateral for accounts receivable subject to monetization recorded as reduction of accounts receivable		10,900
Disallowed tax credits assigned as collateral for accounts receivable subject to monetization		5,800
Customer A | Tax Credits | State of Alaska | Scenario, Forecast
Accounts, Notes, Loans and Financing Receivable [Line Items]
Tax credits assigned as collateral for accounts receivable subject to monetization			$ 58,800
Customer A | Tax Credits | State of Alaska | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Tax credits assigned as collateral for accounts receivable subject to monetization recorded as reduction of accounts receivable	$ 3,500
Customer Concentration Risk | Customer A
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable from customers, current		81,600
Customer Concentration Risk | Customer A | State of Alaska Tax Credits
Accounts, Notes, Loans and Financing Receivable [Line Items]
Tax credits assigned as collateral for accounts receivable		72,900
Customer Concentration Risk | Customer A | State of Alaska Tax Credits | Reclassification Adjustment
Accounts, Notes, Loans and Financing Receivable [Line Items]
Accounts receivable from customers, current		(38,000)
Accounts receivable, net, noncurrent		$ 38,000
Customer Concentration Risk | Customer A | State of Alaska Tax Credits | Subsequent Event
Accounts, Notes, Loans and Financing Receivable [Line Items]
Tax credits assigned as collateral for accounts receivable				$ 16,100
Customer Concentration Risk | Accounts Receivable | Customer A
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage		76.00%