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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 (in thousands)

 
 
Balance at the
Beginning of
the Year ($)
 
Charged to
Expense ($)
 
Acquisitions/
Transfers
and
Other ($)
 
Write-offs
Net of
Recoveries ($)
 
Balance at
the End of
the Year ($)
Allowance for Doubtful Accounts:
 
 
 
 
 
 
 
 
 
 
December 31, 2015
 
143

 
304

 
1

 
(196
)
 
252

December 31, 2016
 
252

 
(106
)
 
—

 
(120
)
 
26

December 31, 2017
 
26

 
10

 
—

 
—

 
36