Commitments and Contingencies (Estimated Obligations and Companies Share for the Annual Charter Payment) (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
VAALCO ENERGY, INC.
Estimated obligation and company share for annual charter payment
Annual charter payment, 2019		$ 9,718
Annual charter payment, 2020		7,029
Annual charter payment, Total		16,747
Full Charter Payment [Member]
Estimated obligation and company share for annual charter payment
Annual charter payment, 2019		31,294
Annual charter payment, 2020		22,634
Annual charter payment, Total	$ 53,900	$ 53,928