Divestitures	3 Months Ended
Mar. 31, 2015
Property, Plant and Equipment Impairment or Disposal [Abstract]
Divestiture	DIVESTITURES We sold non-core oil and natural gas assets, net of related expenses, for less than $0.1 million during the first quarter of 2015, compared to $8.7 million during the first quarter of 2014. Proceeds from those sales reduced the net book value of our full cost pool with no gain or loss recognized. In December 2014, we removed from service 31 drilling rigs, some older top drives, and certain drill pipe no longer marketable under the current environment. During the first quarter of 2015, we sold one of these drilling rigs to an unaffiliated third party. The proceeds of this sale, less costs to sell, exceeded the $0.3 million net book value of the drilling rig resulting in a gain of $7,900. During the first quarter of 2014, we sold four idle 3,000 horsepower drilling rigs to an unaffiliated third-party. 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.

Divestitures

3 Months Ended

Mar. 31, 2015

Property, Plant and Equipment Impairment or Disposal [Abstract]

DIVESTITURES

We sold non-core oil and natural gas assets, net of related expenses, for less than $0.1 million during the first quarter of 2015, compared to $8.7 million during the first quarter of 2014. Proceeds from those sales reduced the net book value of our full cost pool with no gain or loss recognized.

In December 2014, we removed from service 31 drilling rigs, some older top drives, and certain drill pipe no longer marketable under the current environment. During the first quarter of 2015, we sold one of these drilling rigs to an unaffiliated third party. The proceeds of this sale, less costs to sell, exceeded the $0.3 million net book value of the drilling rig resulting in a gain of $7,900.

During the first quarter of 2014, we sold four idle 3,000 horsepower drilling rigs to an unaffiliated third-party. 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.