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SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Allowance for doubtful accounts, sales returns and cash discounts      
Changes to valuation allowance      
Balance at beginning of period $ 2,045 $ 1,589 $ 1,105
Charged to cost and expenses 9,664 9,583 7,890
Deductions (9,831) (9,127) (7,406)
Balance at end of period 1,878 2,045 1,589
Allowance on Deferred Tax Assets and Unrecognized Tax Benefits      
Changes to valuation allowance      
Balance at beginning of period 43,853 42,748 40,680
Charged to cost and expenses (7,860) 1,105 2,068
Balance at end of period $ 35,993 $ 43,853 $ 42,748