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Detail of Certain Balance Sheet Accounts (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Activity in allowance for doubtful accounts |  |  |
Balance at beginning of year | $ 5,898 | $ 3,400 | $ 4,288
Bad debt expense (benefit) | 2,978 | 3,562 | 182
Deductions for uncollectible receivables written off, net of recoveries | (3,924) | (1,304) | (1,829)
Allowance for doubtful accounts of acquired companies at date of acquisition | 1,955 | 240 | 759
Balance at end of year | 6,907 | 5,898 | $ 3,400
Other current liabilities |  |  |
Accrued warranty costs | 7,452 | 6,453 |
Current lease liability | 14,016 |  |
Operating lease liability | 86,713 |  |
Accrued job losses | 2,226 | 1,495 |
Accrued sales and use tax | 2,938 | 2,685 |
Deferred revenue | 5,506 | 5,233 |
Liabilities due to former owners | 11,219 | 2,045 |
Other current liabilities | 38,273 | 14,941 |
Total other current liabilities | $ 81,630 | $ 32,852 |

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