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Goodwill and Other Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Changes in Carrying Amounts of Goodwill by Operating Segment
The table below summarizes the changes in the carrying amount of goodwill by reportable segment:   
 
Corporate
Finance &
Restructuring
 
Forensic and
Litigation
Consulting
 
Economic
Consulting
 
Technology
 
Strategic
Communications
 
Total
Balance at December 31, 2017
 
 
 
 
 
 
 
 
 
 
 
Goodwill
$
454,816

 
$
233,719

 
$
268,995

 
$
117,740

 
$
323,672

 
$
1,398,942

Accumulated goodwill impairment
—

 
—

 
—

 
—

 
(194,139
)
 
(194,139
)
Goodwill, net at December 31, 2017
454,816


233,719


268,995


117,740


129,533


1,204,803

Sale of business (1)
—

 
—

 
—

 
(20,928
)
 
—

 
(20,928
)
Foreign currency translation adjustment and other
(3,060
)
 
(1,515
)
 
(276
)
 
(52
)
 
(3,043
)
 
(7,946
)
Balance at September 30, 2018
 
 
 
 
 
 
 
 
 
 
 
Goodwill
451,756


232,204


268,719


96,760

 
320,629

 
1,370,068

Accumulated goodwill impairment
—

 
—

 
—

 
—

 
(194,139
)
 
(194,139
)
Goodwill, net at September 30, 2018
$
451,756


$
232,204


$
268,719


$
96,760


$
126,490


$
1,175,929


(1) 
During the three months ended September 30, 2018, we sold a business within our Technology segment for proceeds of $50.3 million. We wrote off $20.9 million in goodwill as a result of the sale.
Schedule of Future Amortization Expense Intangible Assets
We estimate our future amortization expense for our intangible assets with finite lives to be as follows: 
Year
As of
September 30, 2018(1)
2018 (remaining)
$
1,876

2019
7,356

2020
7,240

2021
6,711

2022
4,933

Thereafter
3,513

 
$
31,629


(1) 
Actual amortization expense to be reported in future periods could differ from these estimates because of new intangible asset acquisitions, changes in useful lives or other relevant factors or changes.