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Schedule II - Consolidated Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
SEC Schedule, 12-09, Allowance, Credit Loss [Member]    
Balance at beginning of period $ 952 $ 1,268
Additions charged to costs and expenses 452 187
Deductions [1] (1,162) (503)
Balance at end of period 242 952
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]    
Balance at beginning of period 372 421
Additions charged to costs and expenses 0 0
Deductions (74) (49)
Balance at end of period 298 372
Allowance for Discounts and Returns [Member]    
Balance at beginning of period 1,480 1,600
Additions charged to costs and expenses 23,223 19,492
Deductions (22,885) (19,612)
Balance at end of period $ 1,818 $ 1,480
[1] Amount charged off, net of recoveries