Annual report pursuant to Section 13 and 15(d)

Schedule II - Valuation And Qualifying Accounts (Details)

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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
Valuation And Qualifying Accounts [Abstract]      
Balance at Beginning of Period $ 3,497 $ 3,632 $ 3,488
Charged to Costs and Expenses 3,248 2,113 3,846
Deductions 2,650 2,248 3,702
Balance at End of Period $ 4,095 $ 3,497 $ 3,632