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Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Allowance for doubtful accounts |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance | $ 1,117 | $ 461 | $ 272
Additions | 514 | 852 | 223
Deductions (Chargeoffs) | (539) | (196) | (34)
Balance | 1,092 | 1,117 | 461
Valuation allowance for deferred tax assets |  |  |
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items] |  |  |
Balance | 33,876 | 28,357 | 39,111
Additions | 5,977 | 5,519 |
Deductions (Chargeoffs) |  |  | (10,754)
Balance | $ 39,853 | $ 33,876 | $ 28,357

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