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Properties and Equipment, Net - Summary of Assets Held-for-sale (Details) - Assets Held-for-sale $ in Thousands | Dec. 31, 2017 USD ($)
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ASSETS |
Inventories | $ 1,440
Properties and equipment, net | 778,855
Assets | 780,295
LIABILITIES |
Accounts payable | 2,352
Asset retirement obligation | 15,748
Liabilities | 18,100
Net assets | $ 762,195

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