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Income Taxes
6 Months Ended
Jun. 30, 2013
Income Taxes [Abstract]  
Income Taxes
12.  Income Taxes

The Company's effective tax rates for the three months ended June 30, 2013 and 2012 were (28.8%) and (4.9%), respectively, and for the six months ended June 30, 2013 and 2012 were 345.1% and (6.5%), respectively.  The difference in the effective rates for both the three months and six months ended June 30, 2013 and 2012 was due to
 
 
 
the impact of the Company's improved financial results under generally accepted accounting principles. The Company's tax expense mainly reflects its cash tax position for states that do not allow for or have suspended the use of net operating losses for the period.

The Company recorded additional interest charges related to its tax contingency reserve for the six months ended June 30, 2013.  Tax returns for years 2008 through 2011 are subject to future examination by tax authorities.  In addition, certain tax returns are open from 2000 through 2007 to the extent of the net operating losses generated during those periods.