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Variable Interest Entities Balance Sheet (Details) - Variable Interest Entity, Primary Beneficiary [Member] $ in Thousands	Mar. 31, 2018 USD ($)
Cash [Member]
ASSETS
Current assets	$ 1,966
Receivables - Related Party [Member]
ASSETS
Current assets	13,411
Receivables Excluding Third Party [Member]
ASSETS
Current assets	9,645
Other Current Assets [Member]
ASSETS
Current assets	3,242
Property, Plant and Equipment [Member]
ASSETS
Non-current assets	899,558
Other Noncurrent Assets [Member]
ASSETS
Non-current assets	4,294
Accounts Payable [Member]
Liabilities:
Current liabilities	23,363
Accounts Payable - Related Party [Member]
Liabilities:
Current liabilities	3,056
Revolving Credit Facility [Member]
Liabilities:
Current liabilities	20,000
Long-term Debt [Member]
Liabilities:
Non-current liabilities	$ 392,647

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-Publisher FASB
-Name Accounting Standards Codification
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