Acquisitions - Preliminary Purchase Price Allocation (Details) - LLOG Exploration Offshore L.L.C. and LLOG Bluewater Holdings, L.L.C. $ in Thousands	1 Months Ended
	Jun. 30, 2019 USD ($)
Business Acquisition [Line Items]
Cash consideration paid	$ 1,236,165
Contingent consideration	89,444
Total purchase consideration	1,325,609
Fair value of Property, plant and equipment	1,356,185
Other assets	6,697
Less:  Asset retirement obligations	(37,273)
Total net assets	$ 1,325,609