Variable Interest Entities Balance Sheet (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019
Assets:
Current assets	$ 430,722	$ 498,101
TOTAL ASSETS	8,319,684	9,060,806	$ 9,146,697
Liabilities:
Current liabilities	476,524	528,939
TOTAL LIABILITIES	3,752,730	4,098,497
Variable Interest Entity, Primary Beneficiary
Assets:
TOTAL ASSETS	1,238,890	1,234,602
Liabilities:
TOTAL LIABILITIES	882,757	777,989
Cash | Variable Interest Entity, Primary Beneficiary
Assets:
Current assets	989	31
Receivables - Related Party | Variable Interest Entity, Primary Beneficiary
Assets:
Current assets	16,583	21,076
Receivables - Third Party | Variable Interest Entity, Primary Beneficiary
Assets:
Current assets	8,615	7,935
Other Current Assets | Variable Interest Entity, Primary Beneficiary
Assets:
Current assets	1,672	1,976
Property, Plant and Equipment, net | Variable Interest Entity, Primary Beneficiary
Assets:
Noncurrent assets	1,206,739	1,195,591
Operating Lease ROU Asset | Variable Interest Entity, Primary Beneficiary
Assets:
Noncurrent assets	1,594	4,731
Other Assets | Variable Interest Entity, Primary Beneficiary
Assets:
Noncurrent assets	2,698	3,262
Accounts Payable and Accrued Liabilities | Variable Interest Entity, Primary Beneficiary
Liabilities:
Current liabilities	31,931	67,290
Accounts Payable - Related Party | Variable Interest Entity, Primary Beneficiary
Liabilities:
Current liabilities	52,191	4,787
Revolving Credit Facility | Variable Interest Entity, Primary Beneficiary
Liabilities:
Current liabilities	319,000	311,750
Long-Term Debt | Variable Interest Entity, Primary Beneficiary
Liabilities:
Noncurrent liabilities	394,635	394,162
Long-Term Liabilities - Related Party | Variable Interest Entity, Primary Beneficiary
Liabilities:
Noncurrent liabilities	$ 85,000	$ 0