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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts
SCHEDULE II—VALUATION AND QUALIFYING ACCOUNTS
 
Valuation and Qualifying Accounts (in thousands)
Description
Balance at
Beginning of 
Period
 
Charged to
Expense
 
(Uncollectible
Accounts
Written Off, 
Net of 
Recoveries)
 
Balance at End of Period
Fiscal year ended December 31, 2017 Allowance for doubtful accounts
$
2,622

 
$
454

 
$
457

 
$
3,534

Fiscal year ended December 31, 2016 Allowance for doubtful accounts
$
1,231

 
$
2,171

 
$
(780
)
 
$
2,622

Fiscal year ended December 31, 2015 Allowance for doubtful accounts
$
2,685

 
$
1,685

 
$
(3,139
)
 
$
1,231