REVENUE (Contract Assets) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Contract With Customer, Asset And Liability [Roll Forward]
Contract assets, beginning of year	$ 3,829	$ 0
Revenue recognized from the satisfaction of performance obligations	2,488	11,381
Revenue recognized from changes in estimates of variable consideration	(85)	151
Transferred to receivables from contract assets	(3,467)	(7,703)
Total contract assets, end of year	2,765	3,829
Less: noncurrent portion included in other assets	0	(957)
Current portion of contract assets, end of year	$ 2,765	$ 2,872