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Property Dispositions (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2016
USD ($)
a
Boe
Jun. 30, 2016
USD ($)
a
Sep. 30, 2015
USD ($)
BAKKEN      
Property Dispositions [Line Items]      
Proceeds from sale of oil and gas property $ 214.8    
Production, Barrels of Oil Equivalents | Boe 2,700    
NORTH DAKOTA      
Property Dispositions [Line Items]      
Leasehold acreage | a 68,000    
MONTANA      
Property Dispositions [Line Items]      
Leasehold acreage | a 12,000    
WYOMING      
Property Dispositions [Line Items]      
Proceeds from sale of oil and gas property   $ 110.0  
Leasehold acreage | a   132,000  
Gain (loss) on sale of assets   $ 96.9  
Non-core [Member]      
Property Dispositions [Line Items]      
Proceeds from sale of oil and gas property     $ 33.2
OKLAHOMA      
Property Dispositions [Line Items]      
Proceeds from sale of oil and gas property     25.9
Gain (loss) on sale of assets     $ 20.5