Income Taxes	9 Months Ended
Sep. 30, 2016
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company recorded income tax expense of $1.6 million in the third quarter of 2016, an effective tax rate of 16.7% against income before income taxes, and income tax expense of $2.9 million in the third quarter of 2015, with an effective tax rate of 28.1% against income before income taxes. In the first nine months of 2016, income tax expense of $3.1 million was calculated using an effective tax rate of 14.0%, while income tax expense of $9.9 million in the first nine months of 2015 was calculated using an effective tax rate of 27.9%. The Company recorded discrete items in the first nine months of 2016, resulting in a net tax benefit of $1.0 million, primarily due to international tax planning initiatives. The difference between the statutory and effective rates in the third quarter and first nine months of both years was primarily due to these discrete items, the impact of percentage depletion, the foreign rate differential, and other items. The research and development credit also had a favorable effect on the Company's 2016 effective tax rate.

Income Taxes

9 Months Ended

Sep. 30, 2016

The Company recorded income tax expense of $1.6 million in the third quarter of 2016, an effective tax rate of 16.7% against income before income taxes, and income tax expense of $2.9 million in the third quarter of 2015, with an effective tax rate of 28.1% against income before income taxes.

In the first nine months of 2016, income tax expense of $3.1 million was calculated using an effective tax rate of 14.0%, while income tax expense of $9.9 million in the first nine months of 2015 was calculated using an effective tax rate of 27.9%.

The Company recorded discrete items in the first nine months of 2016, resulting in a net tax benefit of $1.0 million, primarily due to international tax planning initiatives. The difference between the statutory and effective rates in the third quarter and first nine months of both years was primarily due to these discrete items, the impact of percentage depletion, the foreign rate differential, and other items. The research and development credit also had a favorable effect on the Company's 2016 effective tax rate.