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Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2018
Valuation and Qualifying Accounts [Abstract]  
Valuation and Qualifying Accounts
Schedule II – Valuation and Qualifying Accounts
(in thousands)
Balance at Beginning of Period
 
Provision for (recovery of) doubtful accounts, net
 
Write-offs and other
 
Balance at End of Period
Allowance for doubtful accounts:
 
 
 
 
 
 
 
December 31, 2018
$
32

 
$
19

 
$
33

 
$
84

December 31, 2017
687

 
$
(19
)
 
$
(636
)
 
32

December 31, 2016
629

 
58

 
—

 
687