5. Income Taxes

The difference between the U.S. federal statutory tax rate of 35% and the Company’s effective tax rates for the three and six months ended June 30, 2015 and 2014 was principally due to state income taxes.

The Company had unrecognized tax benefits of approximately $0.8 million and $0.7 million as of June 30, 2015 and December 31, 2014, respectively, which were included in other liabilities in the accompanying consolidated balance sheets.

The Company’s policy is to recognize interest and penalties related to income tax liabilities as a component of income tax expense in the consolidated statements of operations. The amount of interest and penalties charged to income tax expense because of the unrecognized tax benefits was not material for the three and six months ended June 30, 2015 and 2014.

The Company is subject to taxation in various jurisdictions. The Company is subject to examination by U.S. federal authorities for the open tax years 2011 through 2014 and by various state authorities for the years 2010 through 2014.