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Property, Plant and Equipment - Schedule of Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Oil and natural gas properties    
Proved $ 934,248 $ 840,201
Unproved 111,202 74,937
Total oil and natural gas properties 1,045,450 915,138
Less: accumulated depreciation, depletion and impairment (404,143) (353,030)
Net oil and natural gas properties capitalized costs 641,307 562,108
Land 5,200 5,100
Non-oil and natural gas equipment 158,944 166,010
Buildings and structures 88,503 88,603
Total 252,647 259,713
Less accumulated depreciation and amortization (10,356) (3,889)
Other property, plant and equipment, net 242,291 255,824
Total property, plant and equipment, net $ 883,598 $ 817,932