Annual report pursuant to Section 13 and 15(d)

Valuation And Qualifying Accounts (Details)

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Valuation And Qualifying Accounts (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance Beginning of Year $ 2,871 $ 3,481 $ 2,390
Charges (Credits) to Cost and Expenses 5,261 2,322 2,067
Deductions (2,072) (2,932) (976)
Balance End of Year $ 6,060 $ 2,871 $ 3,481