Variable Interest Entities Balance Sheet (Details) - Variable Interest Entity, Primary Beneficiary - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Assets:
Total Assets	$ 1,181,266	$ 925,428
Liabilities:
Total Liabilities	742,871	526,114
Cash
Assets:
Current assets	1,735	3,966
Receivables - Related Party
Assets:
Current assets	17,845	17,073
Receivables - Third Party
Assets:
Current assets	6,074	7,028
Other Current Assets
Assets:
Current assets	1,646	2,383
Property, Plant and Equipment, net
Assets:
Non-current assets	1,144,177	891,775
Operating Lease ROU Asset
Assets:
Non-current assets	6,281	0
Other Assets
Assets:
Non-current assets	3,508	3,203
Accounts Payable and Accrued Liabilities
Liabilities:
Current liabilities	99,118	43,919
Accounts Payable - Related Party
Liabilities:
Current liabilities	3,788	4,980
Revolving Credit Facility
Liabilities:
Current liabilities	246,000	84,000
Long-Term Debt
Liabilities:
Non-current liabilities	393,925	393,215
Long-Term Operating Lease Liabilities
Liabilities:
Non-current liabilities	$ 40	$ 0