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

A reconciliation of the U.S. federal statutory rate to our effective tax rate is as follows:
 
For the Three Months Ended 
 March 31,
 
2015
 
2014
U.S. federal statutory rate
35.0
 %
 
35.0
 %
    State income taxes
2.1
 %
 
3.1
 %
    Changes in reserve for uncertain tax positions as a result of settlements and lapsed statutes and related interest
-0.4
 %
 
-0.5
 %
    Other
0.2
 %
 
0.2
 %
Effective tax rate
36.9
 %
 
37.8
 %


The differences between the U.S. federal statutory rate and our effective tax rate are primarily due to state income taxes and reserves for uncertain tax positions and related interest that are included in the provision for income taxes. The decrease in the effective tax rate was primarily the result of additional state taxes recognized during the first quarter of 2014 related to the impact of revaluing deferred taxes for changes in state tax laws enacted during the quarter.