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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2018
Accounting Policies [Abstract]  
Schedule of Allowance for Doubtful Accounts
The following presents the changes in the balance of our allowance for doubtful accounts:

໿
Year Ended
 
Item
 
Balance at beginning of year
 
Additions charged to expense
 
Other
 
Balance at end of year
2018
 
Allowance for doubtful accounts
 
$
10,258

 
$
1,824

 
$
(3,659
)
 
$
8,423

2017
 
Allowance for doubtful accounts
 
12,920

 
1,051

 
(3,713
)
 
10,258

2016
 
Allowance for doubtful accounts
 
14,139

 
1,552

 
(2,771
)
 
12,920