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Valuation and Qualifying Accounts (Tables)
 12 Months Ended
Dec. 31, 2015
Valuation and Qualifying Accounts [Abstract]  
Schedule of Valuation and Qualifying Accounts

(in thousands)

    Balance at
Beginning of
Fiscal Year		      Charge to Costs
and
Expenses
(Recovery of
write-offs)		      Deductions
From
Reserves		     Balance at End
of Fiscal Year		  

Year ended December 31, 2015:

           

Allowance for doubtful accounts

    $ 585       $ 773       $ (477 )    $ 881   

Year ended December 31, 2014:

           

Allowance for doubtful accounts

    $ 290       $ 303       $ (8 )    $ 585   

Year ended December 31, 2013:

           

Allowance for doubtful accounts

    $ 301       $ 63       $ (74 )    $ 290