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Deferred Engineering Costs	9 Months Ended
Deferred Engineering Costs	Sep. 30, 2017
Deferred Costs [Abstract]
Deferred Engineering Costs	DEFERRED ENGINEERING COSTS Deferred engineering costs of $9.0 million represent detailed engineering services related to the Driftwood Project. Such costs will be deferred until construction commences on the Driftwood Project, at which time they will be transferred to construction in progress.