Amount of loss from reductions in inventory due to subsequent measurement adjustments, including, but not limited to, physical deterioration, obsolescence, or changes in price levels.

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Name:	us-gaap_InventoryWriteDown
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

INVENTORY AND LONG-TERM PARTS INVENTORY (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Inventory [Line Items]
Lower of cost or net realizable value inventory adjustments	$ 930	$ 0	$ 76	$ 705	$ 1,571	$ 666	$ 317	$ 3,825	$ 1,711	$ 6,379	$ 20,374
Costs associated with abnormal production and other											1,707
East Facility [Member]
Inventory [Line Items]
Costs associated with abnormal production and other											$ 1,707