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Supplemental Selected Quarterly Financial Information (Unaudited)
12 Months Ended
Dec. 31, 2011
Supplemental Selected Quarterly Financial Information [Abstract]  
Supplemental Selected Quarterly Financial Information

(22)  Supplemental Selected Quarterly Financial Information (Unaudited)

 

Financial information by quarter is summarized below for the years ended December 31, 2011 and 2010.