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Schedule II-Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2015
Valuation and Qualifying Accounts [Abstract]  
Schedule II-Valuation and Qualifying Accounts
Schedule II—Valuation and Qualifying Accounts
(in thousands)
 
Balance at
Beginning of
Period
 
Additions
Charged to
Operations or
Other Accounts
 
Write-offs, net
of recoveries
 
Balance at
End of Period
Allowance for Doubtful Accounts:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Year Ended December 31, 2015
$
443

 
$
(89
)
 
$
(13
)
 
$
341

 
 
 
 
 
 
 
 
Year Ended December 31, 2014
$
601

 
$
(112
)
 
$
(46
)
 
$
443

 
 
 
 
 
 
 
 
Year Ended December 31, 2013
$
691

 
$
142

 
$
(232
)
 
$
601