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Real Estate Charges (Tables)
 12 Months Ended
Dec. 31, 2017
Restructuring and Related Activities [Abstract]  
Real Estate Liability Account Activity Related to Workforce Reduction
The activity in the liability account relating to our global space consolidation initiatives for the following periods is:
 
Year Ended December 31,
 
2017
 
2016
 
(in thousands)
Balance as of January 1,
$
112,932

 
$
123,912

Expense incurred
28,507

 
12,248

Deferred rent
7,083

 
4,930

Payments made
(39,122
)
 
(32,988
)
Interest accretion
4,235

 
4,830

Balance as of end of period
$
113,635

 
$
112,932