Financial Instruments, Fair Value Measurement, Credit Risk and Foreign Exchange Risk - Foreign Exchange Risk (Details) - Forecast - Collars: January 1, to December 31, 2020 $ in Thousands, $ in Millions	Dec. 31, 2020 USD ($) $ / collar	Dec. 31, 2020 COP ($) $ / collar
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Amount hedged	$ 40,994	$ 134,500
Sold | Put
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Floor Price (COP, Weighted Average)	3,305	3,305
Purchased | Call
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Cap Price (COP, Weighted Average)	3,423	3,423