Impairment of Property and Equipment	9 Months Ended
Sep. 30, 2014
Property, Plant and Equipment Impairment or Disposal [Abstract]
Impairment of Property and Equipment	Impairment of Property and Equipment We impair our long-lived assets, including oil and gas properties and contract drilling equipment, when estimated undiscounted future net cash flows of an asset are less than its carrying value. The amount of any such impairment is recognized based on the difference between the carrying value and the estimated fair value of the asset. We categorize the measurement of fair value of these assets as Level 3 inputs. We estimate the fair value of the impaired property by applying weighting factors to fair values determined under three different methods: discounted cash flow method, flowing daily production method and proved reserves per BOE method. We then assign applicable weighting factors based on the relevant facts and circumstances. We recorded no provision for impairment of proved properties for the three months ended September 30, 2014, and $0.7 million for the three months ended September 30, 2013. We recorded a provision for impairment of proved properties of $3.4 million for the nine months ended September 30, 2014 and $89.8 million for the nine months ended September 30, 2013. The impairment for the three months ended September 30, 2013 was related to the write down of certain non-core Permian Basin properties to their estimated fair value. The impairment for the nine months ended September 30, 2014 was related to the write down of certain non-operated properties located in North Dakota to their estimated fair value. The impairment for the nine months ended September 30, 2013 was related to the write down of our Andrews County Wolfberry assets and certain non-core Permian Basin properties to their estimated fair value. Unproved properties are nonproducing and do not have estimable cash flow streams. Therefore, we estimate the fair value of individually significant prospects by obtaining, when available, information about recent market transactions in the vicinity of the prospects and adjust the market data as needed to give consideration to the proximity of the prospects to known fields and reservoirs, the extent of geological and geophysical data on the prospects, the remaining terms of leases holding the acreage in the prospects, recent drilling results in the vicinity of the prospects and other risk-related factors such as drilling and completion costs, estimated product prices and other economic factors. Individually insignificant prospects are grouped and impaired based on remaining lease terms and our historical experience with similar prospects. Based on the assessments previously discussed, we will impair our unproved oil and gas properties when we determine that a prospect’s carrying value exceeds its estimated fair value. We categorize the measurement of fair value of unproved properties as Level 3 inputs. We recorded provisions for impairment of unproved properties aggregating $0.9 million for the three months ended September 30, 2014, $0.6 million for the three months ended September 30, 2013, $5.9 million for the nine months ended September 30, 2014 and $0.9 million for the nine months ended September 30, 2013, and charged these impairments to abandonments and impairments in the accompanying consolidated statements of operations and comprehensive income (loss).

Impairment of Property and Equipment

We impair our long-lived assets, including oil and gas properties and contract drilling equipment, when estimated undiscounted future net cash flows of an asset are less than its carrying value. The amount of any such impairment is recognized based on the difference between the carrying value and the estimated fair value of the asset. We categorize the measurement of fair value of these assets as Level 3 inputs. We estimate the fair value of the impaired property by applying weighting factors to fair values determined under three different methods: discounted cash flow method, flowing daily production method and proved reserves per BOE method. We then assign applicable weighting factors based on the relevant facts and circumstances. We recorded no provision for impairment of proved properties for the three months ended September 30, 2014, and $0.7 million for the three months ended September 30, 2013. We recorded a provision for impairment of proved properties of $3.4 million for the nine months ended September 30, 2014 and $89.8 million for the nine months ended September 30, 2013. The impairment for the three months ended September 30, 2013 was related to the write down of certain non-core Permian Basin properties to their estimated fair value. The impairment for the nine months ended September 30, 2014 was related to the write down of certain non-operated properties located in North Dakota to their estimated fair value. The impairment for the nine months ended September 30, 2013 was related to the write down of our Andrews County Wolfberry assets and certain non-core Permian Basin properties to their estimated fair value.

Unproved properties are nonproducing and do not have estimable cash flow streams. Therefore, we estimate the fair value of individually significant prospects by obtaining, when available, information about recent market transactions in the vicinity of the prospects and adjust the market data as needed to give consideration to the proximity of the prospects to known fields and reservoirs, the extent of geological and geophysical data on the prospects, the remaining terms of leases holding the acreage in the prospects, recent drilling results in the vicinity of the prospects and other risk-related factors such as drilling and completion costs, estimated product prices and other economic factors. Individually insignificant prospects are grouped and impaired based on remaining lease terms and our historical experience with similar prospects. Based on the assessments previously discussed, we will impair our unproved oil and gas properties when we determine that a prospect’s carrying value exceeds its estimated fair value. We categorize the measurement of fair value of unproved properties as Level 3 inputs. We recorded provisions for impairment of unproved properties aggregating $0.9 million for the three months ended September 30, 2014, $0.6 million for the three months ended September 30, 2013, $5.9 million for the nine months ended September 30, 2014 and $0.9 million for the nine months ended September 30, 2013, and charged these impairments to abandonments and impairments in the accompanying consolidated statements of operations and comprehensive income (loss).