Supplemental Disclosures of Cash Flow Information Supplemental Cash Flow Elements (Details) - USD ($) shares in Thousands, $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Supplemental Cash Flow Elements [Line Items]
Interest, net of capitalized interest	$ 39,168	$ 29,034
Income taxes	(204)	200
Capital Expenditures Incurred but Not yet Paid	(7,223)	41,273
Increase (Decrease) in Asset Retirement Obligations	$ 44,082	$ (1,139)
Noncash or Part Noncash Acquisition, Noncash Financial or Equity Instrument Consideration, Shares Issued	1,009,015	0
Operating Lease, Payments	$ 4,421	$ 2,914
Operating Cash Flow from Financing Leases	109	127
Finance Lease, Principal Payments	985	988
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	4,217	1,428
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability	$ 703	$ 1,593