Income Taxes	6 Months Ended
Jun. 30, 2016
Income Taxes [Abstract]
Income Taxes	(10)Income Taxes Our effective tax rate (ETR) for first half 2016 was 15% compared to 29% for first half 2015. Assuming no changes in our expected results of operations, we expect our ETR for the last half 2016 and for the year 2017 to be about the same as first half 2016. Our ETR differs from the statutory rate due primarily to statutory depletion in excess of tax basis, which is a permanent difference.

Income Taxes

6 Months Ended

Jun. 30, 2016

(10)Income Taxes

Our effective tax rate (ETR) for first half 2016 was 15% compared to 29% for first half 2015. Assuming no changes in our expected results of operations, we expect our ETR for the last half 2016 and for the year 2017 to be about the same as first half 2016. Our ETR differs from the statutory rate due primarily to statutory depletion in excess of tax basis, which is a permanent difference.