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SCHEDULE II-VALUATION AND QUALIFYING ACCOUNTS
 12 Months Ended
Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts [Abstract]  
Schedule II - Valuation and Qualifying Accounts
  Additions  
Balance at
Beginning
of Year		Charged to
Costs and
Expenses		Charged
other
Accounts		DeductionsBalance at
End of Year
Year Ended December 31, 2016     
Change in Tax Valuation Allowance$14,309 — 941 — $15,250 
Allowance for Doubtful Accounts$90 347 — 20 $417 
Reserve for Inventory Obsolescence$121 872 — 583 $410 
Year Ended December 31, 2017     
Change in Tax Valuation Allowance$15,250 (61)(1,880)— $13,309 
Allowance for Doubtful Accounts$417 1,768 — — $2,185 
Reserve for Inventory Obsolescence$410 2,000 9 1,115 $1,304 
Year Ended December 31, 2018     
Change in Tax Valuation Allowance$13,309 67 (1,256)— $12,120 
Allowance for Doubtful Accounts$2,185 451 — — $2,636 
Reserve for Inventory Obsolescence$1,304 3,343 — 1,980 $2,667