Schedule II - Valuation and Qualifying Accounts - (Details) - Accounts receivable allowance - 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 at Beginning of Period | $ 357 | $ 270 | $ 293 |
Charged to Costs and Expenses | (156) | 216 | 73 |
Charged to Other Accounts | 0 | (129) | 0 |
Uncollectible Accounts Written-off | (101) | 0 | (96) |
Balance at End of Period | $ 100 | $ 357 | $ 270 |