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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 ($)
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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

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