DETAIL OF SELECTED BALANCE SHEET ACCOUNTS - Accounts Receivable (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015
Current:
Accounts receivable			$ 69,733	$ 67,882
Less allowance for doubtful accounts	$ 0	$ 0	(12)	0
Accounts receivable, net			69,721	67,882
Noncurrent:
Accounts receivable			37,984	0
Less allowance for doubtful accounts			0	0
Accounts receivable, net, noncurrent			$ 37,984	$ 0
Allowance for Doubtful Accounts Receivable [Roll Forward]
Beginning balance	0	0
Charges to expense	12	0
Write-offs	0	0
Ending balance	$ (12)	$ 0