The Company uses an estimated annual effective tax rate, which is based on expected annual income, statutory tax rates and tax planning opportunities available in the various jurisdictions in which the Company operates, to determine its quarterly provision for income taxes.

The Company had income tax expenses of $19,000 and $70,000 for continuing operations for the three and six months ended June 30, 2018, respectively, and income tax expenses of $66,000 and $147,000 for continuing operations for the three and six months ended June 30, 2017, respectively. The Company’s effective tax rates were approximately 2.3% and 6.3% for the three and six months ended June 30, 2018, respectively, and 5.7% and 8.4% for the three and six months ended June 30, 2017, respectively.