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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Dec. 31, 2017
Valuation and Qualifying Accounts [Abstract]  
VALUATION AND QUALIFYING ACCOUNTS

SCHEDULE II –VALUATION AND QUALIFYING ACCOUNTS

 

(in thousands)

 

    Balance at
Beginning
of Period		     Charged to
Expense		     Accounts
Written
Off		     Balance at
End of
Period		  
                         
Year ended December 31, 2015                                
Deduction from asset accounts:                                
Allowance for doubtful accounts   $ 1,850       282       (268 )   $ 1,864  
                                 
Year ended December 31, 2016                                
Deduction from asset accounts:                                
Allowance for doubtful accounts   $ 1,864       (462 )     (398 )   $ 1,004  
                                 
Year ended December 31, 2017                                
Deduction from asset accounts:                                
Allowance for doubtful accounts   $ 1,004       86       (52 )   $ 1,038