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INCOME TAXES
3 Months Ended
Mar. 31, 2014
Income Tax Disclosure [Abstract]  
INCOME TAXES
Income Taxes

We calculate our interim period provision for income taxes based on our projected annual effective tax rate as adjusted for certain discrete items.

The table below shows our effective tax rates:
 
 
Three Months Ended March 31
 
 
2014
 
2013
Effective tax rate
 
36.8
%
 
36.5
%


Our effective tax rate normally differs from the federal statutory tax rate of 35% due to additional provision for state income tax obligations. No other items had a significant impact on our effective tax rates during the three months ended March 31, 2014, and 2013.

During the three months ended March 31, 2014, there was no change in our liability for unrecognized tax benefits.