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Properties and Equipment, Net - Summary of Assets Held for Sale (Details) - Assets Held for Sale
$ in Thousands
Jun. 30, 2017
USD ($)
ASSETS  
Inventories $ 2,228
Properties and equipment, net 104,518
Deferred income taxes 6,803
Assets 113,549
LIABILITIES  
Asset retirement obligations 75,693
Liabilities 75,693
Net assets $ 37,856