Divestitures	9 Months Ended
Sep. 30, 2014
Property, Plant and Equipment Impairment or Disposal [Abstract]
Divestiture	DIVESTITURES We sold non-core oil and natural gas assets, net of related expenses, for $18.5 million during the first nine months of 2014, compared to $64.4 million during the first nine months of 2013 (of which $57.1 million was due to the sales in the third quarter of 2013 of our interest in certain Bakken properties). Proceeds from those sales reduced the net book value of our full cost pool with no gain or loss recognized. During the first quarter of 2014, we sold four idle 3,000 horsepower drilling rigs to an unaffiliated third-party. These drilling rigs were previously classified as assets held for sale at December 31, 2013. The proceeds of this sale, less costs to sell, exceeded the $16.3 million net book value of the drilling rigs, both in the aggregate and for each drilling rig, resulting in a gain of $9.6 million. In the second and third quarters of 2013, we sold three 2,000 horsepower electric drilling rigs to unaffiliated third-parties.

Divestitures

9 Months Ended

Sep. 30, 2014

Property, Plant and Equipment Impairment or Disposal [Abstract]

DIVESTITURES

We sold non-core oil and natural gas assets, net of related expenses, for $18.5 million during the first nine months of 2014, compared to $64.4 million during the first nine months of 2013 (of which $57.1 million was due to the sales in the third quarter of 2013 of our interest in certain Bakken properties). Proceeds from those sales reduced the net book value of our full cost pool with no gain or loss recognized.

During the first quarter of 2014, we sold four idle 3,000 horsepower drilling rigs to an unaffiliated third-party. These drilling rigs were previously classified as assets held for sale at December 31, 2013. The proceeds of this sale, less costs to sell, exceeded the $16.3 million net book value of the drilling rigs, both in the aggregate and for each drilling rig, resulting in a gain of $9.6 million.

In the second and third quarters of 2013, we sold three 2,000 horsepower electric drilling rigs to unaffiliated third-parties.