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Schedule II: Valuation and Qualifying Accounts (Details) - Allowance Accounts - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Continuing Operations |  |  |
Movement in Valuation Allowances and Reserves |  |  |
Balance at Beginning of Year | $ 387 | $ 624 | $ 142,940
Additions |  |  |
Amounts Charged Against Operations, net | 76 | (146) | 3,366
Acquired Properties | 3,531 | 387 | 0
Deductions |  |  |
Uncollectible Accounts Written-off | 0 | 0 | (1,887)
Dispositions | 0 | 0 | (143,795)
Balance at End of Year | 3,994 | 387 | 624
Discontinued Operations |  |  |
Movement in Valuation Allowances and Reserves |  |  |
Balance at Beginning of Year | 4,178 | 27,173 | 26,434
Additions |  |  |
Amounts Charged Against Operations, net | 1,026 | 1,695 | 739
Acquired Properties | 175 | 928 | 0
Deductions |  |  |
Uncollectible Accounts Written-off | 0 | 0 | 0
Dispositions | 494 | (700) | 0
Balance at End of Year | $ 5,873 | 4,178 | 27,173
ASU 2016-02 | Continuing Operations |  |  |
Movement in Valuation Allowances and Reserves |  |  |
Balance at Beginning of Year |  | 146 |
Deductions |  |  |
Balance at End of Year |  |  | 146
ASU 2016-02 | Discontinued Operations |  |  |
Movement in Valuation Allowances and Reserves |  |  |
Balance at Beginning of Year |  | $ 2,255 |
Deductions |  |  |
Balance at End of Year |  |  | $ 2,255

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