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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
ANSYS, INC. AND SUBSIDIARIES
Valuation and Qualifying Accounts

(in thousands)
                                Description
 
Balance at
Beginning
of Year
 
Additions:
Charges to Costs
and Expenses
 
Deductions:
Returns and
Write-Offs
 
Balance at
End
of Year
Year ended December 31, 2017
Allowance for doubtful accounts
 
$
5,700

 
$
1,474

 
$
374

 
$
6,800

Year ended December 31, 2016
Allowance for doubtful accounts
 
$
5,200

 
$
2,009

 
$
1,509

 
$
5,700

Year ended December 31, 2015
Allowance for doubtful accounts
 
$
5,500

 
$
1,304

 
$
1,604

 
$
5,200