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Variable Interest Entities Balance Sheet (Details) - Variable Interest Entity, Primary Beneficiary [Member] $ in Thousands | Jun. 30, 2018 USD ($)
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ASSETS |
Total Assets | $ 819,058
Liabilities: |
Total Liabilities | 445,707
Cash [Member] |
ASSETS |
Current assets | 707
Receivables - Related Party [Member] |
ASSETS |
Current assets | 12,072
Receivables Excluding Third Party [Member] |
ASSETS |
Current assets | 7,546
Other Current Assets [Member] |
ASSETS |
Current assets | 2,726
Property, Plant and Equipment [Member] |
ASSETS |
Non-current assets | 792,513
Other Noncurrent Assets [Member] |
ASSETS |
Non-current assets | 3,494
Accounts Payable [Member] |
Liabilities: |
Current liabilities | 38,327
Accounts Payable - Related Party [Member] |
Liabilities: |
Current liabilities | 3,211
Revolving Credit Facility [Member] |
Liabilities: |
Current liabilities | 11,000
Long-term Debt [Member] |
Liabilities: |
Non-current liabilities | $ 393,169

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