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Schedule II - Valuation and Qualifying Accounts - Summary of Valuation and Qualifying Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
SEC Schedule, 12-09, Allowance, Credit Loss [Member]      
Balance at Beginning of Period $ 1,965 $ 1,940 $ 1,610
Additions Charged to Costs and Expenses 1,154 590 575
Additions Charged to Other Accounts 0 0 0
Deductions (1,393) (565) (245)
Balance at End of Period 1,726 1,965 1,940
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]      
Balance at Beginning of Period 2,215 2,055 2,379
Additions Charged to Costs and Expenses 87 160 0
Additions Charged to Other Accounts 0 0 0
Deductions 0 0 (324)
Balance at End of Period $ 2,302 $ 2,215 $ 2,055