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Income Taxes
3 Months Ended
Mar. 31, 2015
Income Tax Disclosure [Abstract]  
Income Taxes

12.

INCOME TAXES

The provision for income taxes is based on a current estimate of the annual effective income tax rate adjusted to reflect the impact of discrete items.  Significant management judgment is required in estimating operating income in order to determine our effective income tax rate.  The estimated effective income tax rate was 41.45% and 42.47% for the three months ended March 31, 2015 and 2014, respectively.  The lower effective income tax rate for the three months ended March 31, 2015 is primarily a result of a lower ratio of nondeductible expenses to pre-tax income.