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Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2016
Valuation and Qualifying Accounts [Abstract]  
Summary of Valuation Allowance
The following table summarizes activity in the Company’s allowance for the years ended December 31 (in thousands):  
 
Balance at
Beginning
of Year
 
Additions
Charged to
Expense
 
Additions
Charged
Against
Revenues
 
Deductions
from
Reserve
 
Balance
at End
of Year
2016:
 
 
 
 
 
 
 
 
 
Allowance for doubtful accounts and returns and allowances
$
6,900

 
$
4,750

 
$
4,850

 
$
(9,100
)
 
$
7,400

2015:
 

 
 

 
 

 
 

 
 

Allowance for doubtful accounts and returns and allowances
$
6,700

 
$
3,480

 
$
5,420

 
$
(8,700
)
 
$
6,900

2014:
 

 
 

 
 

 
 

 
 

Allowance for doubtful accounts and returns and allowances
$
7,000

 
$
2,950

 
$
3,240

 
$
(6,490
)
 
$
6,700