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Property, Plant and Equipment - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Property, Plant and Equipment        
Full cost ceiling limitation impairment $ 251,000   $ 359,400  
Loss on sale of assets (1,330) $ (2,770) (3,210) $ (4,674)
Drilling and oil field services assets        
Property, Plant and Equipment        
Assets held for sale 1,400   1,400  
Drilling And Oil Field Services        
Property, Plant and Equipment        
Loss on sale of assets $ 2,700   $ 1,600