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Income Taxes | 3 Months Ended
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Mar. 31, 2018
Income Tax Disclosure [Abstract] |
Income Taxes | Income Taxes The gross liability for unrecognized tax benefits at March 31, 2018 and December 31, 2017 was $14,685 and $14,480, respectively, exclusive of interest and penalties, of which $13,986 and $13,737 would affect the effective tax rate if the Company were to recognize the tax benefit. The Company classifies interest and penalties on unrecognized tax benefits as income tax expense. As of March 31, 2018 and December 31, 2017, the combined amount of accrued interest and penalties related to tax positions taken on tax returns was $1,218 and $1,175, respectively.
| March 31, 2018 |  | December 31, 2017
Gross liability for unrecognized tax benefits, exclusive of interest and penalties | $ | 14,685 |  |  | $ | 14,480 |
Interest and penalties on unrecognized benefits | 1,218 |  |  | 1,175 |
Total gross uncertain tax positions | $ | 15,903 |  |  | $ | 15,655 |
Amount included in Current liabilities | $ | 2,944 |  |  | $ | 3,275 |
Amount included in Other long-term liabilities | 12,959 |  |  | 12,380 |
| $ | 15,903 |  |  | $ | 15,655 |
The Company's effective income tax rate for the three months ended March 31, 2018 and 2017 differs from the federal income tax statutory rate due to the following:
|  | Three Months Ended March 31,
|  | 2018 |  | 2017
Statutory rate |  | 21.0 | % |  | 35.0 | %
State taxes, net of federal tax benefit |  | 2.2 |  |  | 1.5 |
Foreign tax expense and tax rate differential |  | (0.2 | ) |  | (0.8 | )
Tax benefit from stock option exercises |  | (10.8 | ) |  | (4.2 | )
Other, net |  | (0.3 | ) |  | (0.5 | )
|  | 11.9 | % |  | 31.0 | %
The decrease in the tax rate for the three months ended March 31, 2018 was primarily due to the tax changes enacted in the 2017 Tax Cut and Jobs Act (The Tax Act). The Tax Act was enacted on December 22, 2017 and included a permanent reduction in the corporate tax rate from 35.0 percent to 21.0 percent. In addition, the rate was favorably impacted by an increase in the excess tax benefits recognized on stock-based compensation expense due to a higher volume of stock option exercise activity. The Tax Act also imposed a territorial rather than worldwide system which requires a one-time transition tax on the repatriation of previously deferred foreign earnings. The Company's estimate of the one-time transition tax as of March 31, 2018 was $11,544, of which $915 is expected to be paid within one year and $10,629 is included in Long-term income taxes payable on the accompanying Consolidated Balance Sheet. The Company files income tax returns in the United States on a consolidated basis and in many U.S. state and foreign jurisdictions. The Company is subject to examination of income tax returns by the Internal Revenue Service (IRS) and other domestic and foreign tax authorities. The Company is no longer subject to U.S. federal income tax examination for years before 2014 and is no longer subject to state, local or foreign income tax examinations by authorities for years before 2013. The Company estimates it will recognize $2,944 of gross unrecognized tax benefits. This amount is expected to be paid within one year or to be removed at the expiration of the statute of limitations and resolution of income tax audits and is netted against the current payable account. These unrecognized tax benefits are related to tax positions taken on certain federal, state, and foreign tax returns. However, the timing of the resolution of income tax examinations is highly uncertain, and the amounts ultimately paid, if any, upon resolution of the issues raised by the taxing authorities may differ materially from the amounts accrued for each year. While it is reasonably possible that some issues under examination could be resolved in the next twelve months, based upon the current facts and circumstances, the Company cannot reasonably estimate the timing of such resolution or the total range of potential changes as it relates to the current unrecognized tax benefits that are recorded as part of the Company’s financial statements.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI http://asc.fasb.org/topic&trid=2144680 + Details
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