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Schedule II - Valuation and Qualifying Accounts - 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 [1] $ 438 $ 533
Recovered from/charged to costs and expenses 330 83
Deductions [2],[3] 205 178
Balance at end of period 563 438 [1]
SEC Schedule, 12-09, Valuation Allowance, Deferred Tax Asset [Member]    
Balance at beginning of period [1] 2,511 2,450
Recovered from/charged to costs and expenses 44 61
Deductions [2],[3] 2,158
Balance at end of period $ 397 $ 2,511 [1]
[1] Beginning balance updated to reflect Immaterial Revision to the consolidated financial statements as described further in Note 2. The valuation allowance for deferred tax asset line item disclosure has been included within this table with the balance at the end of the period updated to reflect the revision in the valuation allowance consistent with the description in Note 5.
[2] Uncollectible accounts written off, net of recoveries
[3] Valuation allowance amounts released