Income taxes	6 Months Ended
Jun. 30, 2017
Income taxes [Abstract]
Income taxes	6. Income taxes We recorded an income tax provision for the second quarter of 2017 of $429,000 at an effective tax rate of 33.1%, compared to an income tax provision during the second quarter of 2016 of $355,000 at an effective tax rate of 32.0%. For the six months ended June 30, 2017, we recorded an income tax provision of $888,000 at an effective tax rate of 32.9%, compared to an income tax provision during the six months ended June 30, 2016 of $666,000 at an effective tax rate of 32.6%. We are subject to U.S. federal income tax, as well as income tax in certain state and foreign jurisdictions. We have substantially concluded all U.S. federal income tax, state and local, and foreign tax regulatory examination matters through 2012. During 2013, an examination of our 2010 federal tax return was completed. However, our federal tax returns for the years 2013 through 2015 remain open to examination. Various state and foreign tax jurisdiction tax years remain open to examination as well, though we believe that any additional assessment would be immaterial to the Condensed Consolidated Financial Statements. No state or foreign tax jurisdiction income tax returns are currently under examination. As of June 30, 2017, we had $111,000 of total gross unrecognized tax benefits that, if recognized, would favorably affect the effective income tax rate in any future periods. We expect $31,000 of our $111,000 of unrecognized tax benefits will reverse in 2017 upon expiration of the statute of limitations. We recognize interest and penalties related to uncertain tax positions in the income tax provision. As of June 30, 2017, we have $25,000 of accrued interest and penalties related to uncertain tax positions.

Income taxes

6 Months Ended

Jun. 30, 2017

6. Income taxes

We recorded an income tax provision for the second quarter of 2017 of $429,000 at an effective tax rate of 33.1%, compared to an income tax provision during the second quarter of 2016 of $355,000 at an effective tax rate of 32.0%. For the six months ended June 30, 2017, we recorded an income tax provision of $888,000 at an effective tax rate of 32.9%, compared to an income tax provision during the six months ended June 30, 2016 of $666,000 at an effective tax rate of 32.6%.

We are subject to U.S. federal income tax, as well as income tax in certain state and foreign jurisdictions. We have substantially concluded all U.S. federal income tax, state and local, and foreign tax regulatory examination matters through 2012. During 2013, an examination of our 2010 federal tax return was completed. However, our federal tax returns for the years 2013 through 2015 remain open to examination. Various state and foreign tax jurisdiction tax years remain open to examination as well, though we believe that any additional assessment would be immaterial to the Condensed Consolidated Financial Statements. No state or foreign tax jurisdiction income tax returns are currently under examination. As of June 30, 2017, we had $111,000 of total gross unrecognized tax benefits that, if recognized, would favorably affect the effective income tax rate in any future periods. We expect $31,000 of our $111,000 of unrecognized tax benefits will reverse in 2017 upon expiration of the statute of limitations.

We recognize interest and penalties related to uncertain tax positions in the income tax provision. As of June 30, 2017, we have $25,000 of accrued interest and penalties related to uncertain tax positions.