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Revenue - (Details) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
CONCENTRATION |  |  |
Allowance for doubtful accounts | $ 3,500 |  | $ 3,900
Change in estimate of uncollectible (percent) | 0.50% |  |
Change in revenue recognized due to 0.5% change in uncollectible percentage | $ 500 |  |
Increase (decrease) to revenues | 26,678 | $ 21,810 |
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606 |  |  |
CONCENTRATION |  |  |
Increase (decrease) to revenues | $ 1,207 | $ (37) |

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