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Real Estate Charges (Tables)
3 Months Ended
Mar. 31, 2013
Real Estate Charges [Abstract]  
Real estate liability account activity related to office space consolidation initiatives
The following table summarizes the activity in the liability account relating to our 2010 and 2012 office space consolidation initiatives for the following periods:

 
 
Three Months
Ended March
31, 2013
 
 
Twelve Months
Ended
December 31,
2012
 
 
 
(in thousands)
 
 
 
 
 
 
 
 
Balance as of beginning of period
 
$
238,784
   
$
71,164
 
Expense incurred
   
648
     
181,589
 
Deferred rent
   
122
     
27,000
 
Payments made
   
(21,562
)
   
(42,833
)
Interest accretion
   
1,137
     
1,864
 
Balance as of end of period
 
$
219,129
   
$
238,784