Divestitures	6 Months Ended
Jun. 30, 2014
Divestitures [Abstract]
Divestiture	DIVESTITURES We sold non-core oil and natural gas assets, net of related expenses, for $11.3 million during the first six months of 2014. Proceeds from those dispositions 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. During the second quarter of 2013, we sold one 2,000 horsepower electric drilling rig to an unaffiliated third-party.

DIVESTITURES

We sold non-core oil and natural gas assets, net of related expenses, for $11.3 million during the first six months of 2014. Proceeds from those dispositions 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.

During the second quarter of 2013, we sold one 2,000 horsepower electric drilling rig to an unaffiliated third-party.