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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for Doubtful Accounts [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 360 $ 395 $ 350
Additions charged to costs and expenses 314 418 269
Deductions Describe [1],[2] 404 453 224
Balance at end of period 270 360 395
Reserve for Cancelled Sales and Allowances [Member]      
Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 1,772 1,659 1,627
Additions charged to costs and expenses 11,601 11,402 11,466
Deductions Describe [1],[2] 11,909 11,289 11,434
Balance at end of period $ 1,464 $ 1,772 $ 1,659
[1] Allowance for doubtful accounts: uncollectible accounts written off, net of recoveries.
[2] Reserve for cancelled sales and allowances: impact of sales cancelled after delivery plus amount of allowance given to customers.