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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2016
Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts
(in thousands)
 
Allowance for doubtful accounts
 
 
Year ended December 31,
 
 
2016
 
2015
 
2014
Balance at beginning of year
 
$
814

 
$
741

 
$
141

Charged to costs and expenses
 
1,390

 
943

 
640

Charged to other accounts
 
(1,329
)
 
324

 
—

Reserve adjustments
 
282

 
(1,194
)
 
(40
)
Balance at end of year
 
$
1,157

 
$
814

 
$
741