Natural Gas And Oil Properties	9 Months Ended
Sep. 30, 2015
Natural Gas And Oil Properties [Abstract]
Natural Gas And Oil Properties	(4) NATURAL GAS AND OIL PROPERTIES The Company utilizes the full cost method of accounting for costs related to the exploration, development and acquisition of natural gas and oil reserves. Under this method, all such costs (productive and nonproductive), including salaries, benefits and other internal costs directly attributable to these activities are capitalized on a country by country basis and amortized over the estimated lives of the properties using the units-of-production method. These capitalized costs, less accumulated amortization and related deferred income taxes, are subject to a ceiling test that limits such pooled costs to the aggregate of the present value of future net revenues attributable to proved natural gas and oil reserves discounted at 10% plus the lower of cost or market value of unproved properties. Any costs in excess of the ceiling are written off as a non-cash expense. The expense may not be reversed in future periods, even though higher natural gas and oil prices may subsequently increase the ceiling. Companies using the full cost method must use the average quoted price from the first day of each month from the previous 12 months, including the impact of derivatives qualifying as cash flow hedges, to calculate the ceiling value of their reserves. Using the average quoted price from the first day of each month from the previous 12 months for Henry Hub natural gas of $3.06 per MMBtu, West Texas Intermediate oil of $55.73 per barrel and NGLs of $8.62 per barrel, adjusted for market differentials, the Company’s net book value of its United States natural gas and oil properties exceeded the ceiling by $1,746 million (net of tax) at September 30, 2015 and resulted in a non-cash ceiling test impairment. Cash flow hedges of natural gas production in place increased the ceiling amount by approximately $40 million as of September 30, 2015. In the second quarter of 2015, the Company’s net book value of its United States natural gas and oil properties exceeded the ceiling by approximately $944 million (net of tax) at June 30, 2015 and resulted in a non-cash ceiling test impairment. Decreases in market prices as well as changes in production rates, levels of reserves, evaluation of costs excluded from amortization, future development costs and production costs could result in future ceiling test impairments. Using the first-day-of-the-month prices of natural gas for the first ten months of 2015 and NYMEX strip prices for the remainder of 2015, as applicable, the prices required to be used to determine the ceiling amount in the Company’s full cost ceiling test are likely to require a material write-down in the fourth quarter of 2015. The Company assesses the available positive and negative evidence to estimate if sufficient future taxable income will be generated to utilize its deferred tax assets. A valuation allowance is established to reduce deferred tax assets if it is more likely than not that the related tax benefits will not be realized. While the Company is unable to reasonably estimate the amounts at this time, based on the expected material write-downs of the value of its oil and natural gas properties, it is possible the Company’s deferred tax assets will not be realized in subsequent quarters. Using the average quoted price from the first day of each month from the previous 12 months for Henry Hub natural gas of $4.24 per MMBtu, West Texas Intermediate oil of $95.56 per barrel and NGLs of $36.70 per barrel, adjusted for market differentials, the net book value of the Company’s United States natural gas and oil properties did not exceed the ceiling amount and did not result in a ceiling test impairment at September 30, 2014. Cash flow hedges of natural gas production in place increased the ceiling amount by approximately $14 million as of September 30, 2014. All of the Company’s costs directly associated with the acquisition and evaluation of properties in Canada relating to its exploration program as of September 30, 2015 were unproved and did not exceed the ceiling amount. If the Company’s exploration program in Canada is terminated or otherwise unsuccessful on all or a portion of the Company’s Canadian assets, including the effects of the recently imposed moratorium in New Brunswick and changes in laws or regulations or otherwise, a ceiling test impairment may result in the future.

(4) NATURAL GAS AND OIL PROPERTIES

The Company utilizes the full cost method of accounting for costs related to the exploration, development and acquisition of natural gas and oil reserves. Under this method, all such costs (productive and nonproductive), including salaries, benefits and other internal costs directly attributable to these activities are capitalized on a country by country basis and amortized over the estimated lives of the properties using the units-of-production method. These capitalized costs, less accumulated amortization and related deferred income taxes, are subject to a ceiling test that limits such pooled costs to the aggregate of the present value of future net revenues attributable to proved natural gas and oil reserves discounted at 10% plus the lower of cost or market value of unproved properties. Any costs in excess of the ceiling are written off as a non-cash expense. The expense may not be reversed in future periods, even though higher natural gas and oil prices may subsequently increase the ceiling. Companies using the full cost method must use the average quoted price from the first day of each month from the previous 12 months, including the impact of derivatives qualifying as cash flow hedges, to calculate the ceiling value of their reserves.

Using the average quoted price from the first day of each month from the previous 12 months for Henry Hub natural gas of $3.06 per MMBtu, West Texas Intermediate oil of $55.73 per barrel and NGLs of $8.62 per barrel, adjusted for market differentials, the Company’s net book value of its United States natural gas and oil properties exceeded the ceiling by $1,746 million (net of tax) at September 30, 2015 and resulted in a non-cash ceiling test impairment. Cash flow hedges of natural gas production in place increased the ceiling amount by approximately $40 million as of September 30, 2015. In the second quarter of 2015, the Company’s net book value of its United States natural gas and oil properties exceeded the ceiling by approximately $944 million (net of tax) at June 30, 2015 and resulted in a non-cash ceiling test impairment. Decreases in market prices as well as changes in production rates, levels of reserves, evaluation of costs excluded from amortization, future development costs and production costs could result in future ceiling test impairments. Using the first-day-of-the-month prices of natural gas for the first ten months of 2015 and NYMEX strip prices for the remainder of 2015, as applicable, the prices required to be used to determine the ceiling amount in the Company’s full cost ceiling test are likely to require a material write-down in the fourth quarter of 2015. The Company assesses the available positive and negative evidence to estimate if sufficient future taxable income will be generated to utilize its deferred tax assets. A valuation allowance is established to reduce deferred tax assets if it is more likely than not that the related tax benefits will not be realized. While the Company is unable to reasonably estimate the amounts at this time, based on the expected material write-downs of the value of its oil and natural gas properties, it is possible the Company’s deferred tax assets will not be realized in subsequent quarters.

Using the average quoted price from the first day of each month from the previous 12 months for Henry Hub natural gas of $4.24 per MMBtu, West Texas Intermediate oil of $95.56 per barrel and NGLs of $36.70 per barrel, adjusted for market differentials, the net book value of the Company’s United States natural gas and oil properties did not exceed the ceiling amount and did not result in a ceiling test impairment at September 30, 2014. Cash flow hedges of natural gas production in place increased the ceiling amount by approximately $14 million as of September 30, 2014.

All of the Company’s costs directly associated with the acquisition and evaluation of properties in Canada relating to its exploration program as of September 30, 2015 were unproved and did not exceed the ceiling amount. If the Company’s exploration program in Canada is terminated or otherwise unsuccessful on all or a portion of the Company’s Canadian assets, including the effects of the recently imposed moratorium in New Brunswick and changes in laws or regulations or otherwise, a ceiling test impairment may result in the future.