Income Taxes	6 Months Ended
Jun. 30, 2018
Income Tax Disclosure [Abstract]
Income Taxes	15. INCOME TAXES United records a liability for uncertain income tax positions based on a recognition threshold of more-likely-than-not, and a measurement attribute for all tax positions taken on a tax return, in order for those tax positions to be recognized in the financial statements. As of June 30, 2018 and 2017, the total amount of accrued interest related to uncertain tax positions was $721 and $609, respectively. United accounts for interest and penalties related to uncertain tax positions as part of its provision for federal and state income taxes. United is currently open to audit under the statute of limitations by the Internal Revenue Service for the years ended December 31, 2014, 2015 and 2016 and certain State Taxing authorities for the years ended December 31, 2014 through 2016. On December 22, 2017, the Tax Cuts and Jobs Act (the “Tax Act”) was signed into law. The Tax Act lowered the Federal corporate tax rate from 35% to 21% effective January 1, 2018 and made numerous other tax law changes. U.S. generally accepted accounting principles (GAAP) requires companies to recognize the effect of tax law changes in the period of enactment. As a result of the Tax Act, United was required to remeasure deferred tax assets and liabilities at the new tax rate and as a result, recorded deferred tax expense of $37,732 in the fourth quarter of 2017. Reasonable estimates were made based on the Company’s analysis of the Tax Act. This provisional amount may be adjusted in future periods during 2018 when additional information is obtained as provided for under Staff Accounting Bulletin 118 (“SAB 118”). Additional information that may affect our provisional amount would include further clarification and guidance on how the IRS will implement tax reform, further clarification and guidance on how state taxing authorities will implement tax reform and the related effect on the Company’s state income tax returns, completion of United’s 2017 tax return filings, and the potential for additional guidance from the SEC or the FASB related to the Tax Act. Management continues to evaluate other potential impacts of the Tax Act. The Company did not identify items for which the income tax effects of the Tax Act have not been completed and a reasonable estimate could not be determined as of June 30, 2018. United’s effective tax rate was 22.50% and 22.49% for the second quarter and first six months of 2018 and 34.25% for both the second quarter and first six months of 2017. The lower effective tax rate for the second quarter and first six months of 2018 was due mainly to the Tax Act.

15. INCOME TAXES

United records a liability for uncertain income tax positions based on a recognition threshold of more-likely-than-not, and a measurement attribute for all tax positions taken on a tax return, in order for those tax positions to be recognized in the financial statements.

As of June 30, 2018 and 2017, the total amount of accrued interest related to uncertain tax positions was $721 and $609, respectively. United accounts for interest and penalties related to uncertain tax positions as part of its provision for federal and state income taxes.

United is currently open to audit under the statute of limitations by the Internal Revenue Service for the years ended December 31, 2014, 2015 and 2016 and certain State Taxing authorities for the years ended December 31, 2014 through 2016.

On December 22, 2017, the Tax Cuts and Jobs Act (the “Tax Act”) was signed into law. The Tax Act lowered the Federal corporate tax rate from 35% to 21% effective January 1, 2018 and made numerous other tax law changes. U.S. generally accepted accounting principles (GAAP) requires companies to recognize the effect of tax law changes in the period of enactment. As a result of the Tax Act, United was required to remeasure deferred tax assets and liabilities at the new tax rate and as a result, recorded deferred tax expense of $37,732 in the fourth quarter of 2017. Reasonable estimates were made based on the Company’s analysis of the Tax Act. This provisional amount may be adjusted in future periods during 2018 when additional information is obtained as provided for under Staff Accounting Bulletin 118 (“SAB 118”). Additional information that may affect our provisional amount would include further clarification and guidance on how the IRS will implement tax reform, further clarification and guidance on how state taxing authorities will implement tax reform and the related effect on the Company’s state income tax returns, completion of United’s 2017 tax return filings, and the potential for additional guidance from the SEC or the FASB related to the Tax Act. Management continues to evaluate other potential impacts of the Tax Act. The Company did not identify items for which the income tax effects of the Tax Act have not been completed and a reasonable estimate could not be determined as of June 30, 2018.

United’s effective tax rate was 22.50% and 22.49% for the second quarter and first six months of 2018 and 34.25% for both the second quarter and first six months of 2017. The lower effective tax rate for the second quarter and first six months of 2018 was due mainly to the Tax Act.