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Notes Receivable from Employees (Tables)
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Summary of Changes in Carrying Amount of Notes Receivable From Employees
The table below summarizes the changes in the carrying amount of our notes receivable from employees.
 
December 31,
 
2017
 
2016
Notes receivable from employees — beginning
$
136,388

 
$
142,997

Notes granted
18,247

 
33,943

Repayments
(7,394
)
 
(12,985
)
Amortization expense
(26,821
)
 
(25,566
)
Cumulative translation adjustment and other
3,376

 
(2,001
)
Notes receivable from employees — ending
123,796

 
136,388

Less: current portion
(25,691
)
 
(31,864
)
Notes receivable from employees, net of current portion
$
98,105

 
$
104,524