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Income Taxes - Deferred Tax Asset (Liabilities) (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Net operating loss $ 388,317 $ 611,631
Property and equipment 9,862 23,203
Other 10,263 10,868
Total deferred tax assets 408,442 645,702
Valuation allowance (383,253) (613,866)
Net deferred tax assets 25,189 31,836
Deferred tax liabilities:    
Investment in Laramie Energy 18,140 20,600
Convertible notes 3,193 6,866
Intangible assets 3,978 2,671
Other 863 2,337
Total deferred tax liabilities 26,174 32,474
Total deferred tax liabilities $ (985) $ (638)