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Variable Interest Entities Balance Sheet (Details) - Variable Interest Entity, Primary Beneficiary [Member] $ in Thousands	Jun. 30, 2018 USD ($)
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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