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Real Estate Charges (Tables)
 6 Months Ended
Jun. 30, 2017
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 global space consolidation initiatives for the following periods is:
 
Six Months Ended
June 30, 2017
 
Twelve Months Ended
December 31, 2016
 
(in thousands)
 
 
 
 
Balance as of beginning of period
$
112,932

 
$
123,912

Expense (credit) incurred
15,940

 
12,248

Deferred rent
3,601

 
4,930

Payments made
(20,861
)
 
(32,988
)
Interest accretion
2,074

 
4,830

Balance as of end of period
$
113,686

 
$
112,932