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Uncertain Tax Positions (Tables)
3 Months Ended
Mar. 31, 2012
Uncertain Tax Positions [Abstract]  
Reconciliation of unrecognized tax benefits
As of December 31, 2011, the Company had approximately $2.1 million of total gross unrecognized tax benefits.  If these benefits were recognized, they would favorably affect the net effective income tax rate in any future period.  As of March 31, 2012, the Company had approximately $3.4 million of total gross unrecognized tax benefits.  If recognized, these benefits would favorably affect the net effective income tax rate in any future period. A reconciliation of the beginning and ending amount of unrecognized tax benefits is as follows (in thousands of dollars):

Balance at January 1, 2012
 $2,060 
      
Gross increases- current year tax positions
  1,343 
Gross increases- tax positions from prior periods
  4 
      
Balance at March 31, 2012
 $3,407