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Real Estate Charges (Tables)
 6 Months Ended
Jun. 30, 2015
Restructuring and Related Activities [Abstract]  
Real estate liability account activity related to office space consolidation initiatives
The activity in the liability account relating to our 2010 and 2012 office space consolidation initiatives for the following periods is as follows:
 
 
Six Months Ended
June 30, 2015
 
Twelve Months Ended
December 31, 2014
 
(in thousands)
 
 
 
 
Balance as of beginning of period
$
148,429

 
$
199,527

Expense (credit) incurred
(65
)
 
(4,755
)
Deferred rent
—

 
—

Payments made
(24,435
)
 
(50,893
)
Interest accretion
2,167

 
4,550

Balance as of end of period
$
126,096

 
$
148,429