Business Combinations - Pro Forma Results of Acquisition (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
PetroLatina
Business Acquisition [Line Items]
Oil and gas sales	$ 323,266	$ 357,693
Net loss	$ (309,972)	$ (288,389)
Net loss per share - basic and diluted (in dollars per share)	$ (0.97)	$ (1.01)
Petroamerica
Business Acquisition [Line Items]
Oil and gas sales	$ 289,739	$ 332,867
Net loss	$ (466,506)	$ (276,852)
Net loss per share - basic and diluted (in dollars per share)	$ (1.45)	$ (0.97)