Petroleum and Natural Gas Sales (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016
Revenue [abstract]
Petroleum and natural gas sales	$ 252,591	$ 122,360
Less: Royalties	104,127	59,226
Petroleum and natural gas sales, net of royalties	$ 148,464	$ 63,134

The amount of revenue arising from the sale of oil and gas products. [Refer: Revenue]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
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-IssueDate 2017-01-01
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