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Real Estate Charges (Tables)
 6 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2012
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:

 
   Six Months
Ended
June 30,
2013		   Twelve Months
Ended
December 31,
2012		  
 
   (in thousands)
  

Balance as of beginning of period

   $ 238,784   $ 71,164  

Expense incurred

     2,150     181,589  

Deferred rent

     122     27,000  

Payments made

     (36,719 )   (42,833 )

Interest accretion

     2,274     1,864  
           

Balance as of end of period

   $ 206,611   $ 238,784  
           
The following table summarizes the activity in the liability account relating to our 2010 and 2012 office space consolidation initiatives for the following periods:

 
 
Years Ended December 31,
 
 
 
2012
 
 
2011
 
 
 
(in thousands)
 
 
 
 
 
 
 
 
Balance as of January 1,
 
$
71,164
 
 
$
89,793
 
Expense (credit) incurred
 
 
181,589
 
 
 
(3,506
)
Deferred rent
 
 
27,000
 
 
 
2,288
 
Payments made
 
 
(42,833
)
 
 
(18,696
)
Interest accretion
 
 
1,864
 
 
 
1,285
 
Balance as of end of period
 
$
238,784
 
 
$
71,164